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What about Exabytes, Zettabytes, and Yottabytes?

A petabyte is 1,125,899,906,842,624 bytes.
An exabyte is 1,152,921,504,606,846,976 bytes.
A zettabyte is 1,180,591,620,717,411,303,424 bytes.
A yottabyte is 1,208,925,819,614,629,174,706,176 bytes.

Here are some uses for data sizes. (thanks to wikipedia)

1 bit
1 bit – True or false.
3 bits – The size of an octal digit.
4 bits – A semioctet or nibble (sometimes spelled nybble). The size of a hexadecimal digit.
5 bits – Size of code points in the Baudot code, used in telex communication.
6 bits – Size of code points in the Braille code, a tactile writing system for the blind.
7 bits – Size of code points in the ASCII character set.
8 bits – An octet. Equivalent to a byte on many computer architectures.

10 bits –
One decabit minimum length to store a single group of 3 decimal digits.
minimum byte length to store a single octet with error-correcting memory.
minimum frame length to transmit a single octet with asynchronous serial protocols.

12 bits – Wordlength of the PDP-8 of Digital Equipment Corporation (built from 1965 -1990)
16 bits – In many programming languages, the size of an integer capable of holding 65,536 different values.
16 bits – The "word size" (instruction length) for the various "second generation" console systems, including: Super Nintendo, Sega Genesis
32 bits (4 octets) – Size of an integer capable of holding 4,294,967,296 different values.
32 bits – Size of an IEEE 754 single-precision floating point number.
32 bits – Size of addresses in IPv4, the current Internet protocol.
56 bits (7 octets) – Cipher strength of the DES encryption standard.
64 bits (8 octets) – Size of an integer capable of holding 18,446,744,073,709,551,616 different values.
64 bits – Size of an IEEE 754 double-precision floating point number.
80 bits (10 octets) – Size of an extended precision floating point number, for intermediate calculations that can be performed in floating point units of most processors of the x86 family.

100 bits – One hectobit
128 bits (16 octets) – Size of addresses in IPv6, the emerging Internet protocol.
Minimum cipher strength of the Rijndael and AES encryption standards, and of the widely used MD5 cryptographic message digest algorithm.
160 bits – Maximum key length of the SHA-1, standard Tiger (hash), and Tiger2 cryptographic message digest algorithms.
256 bits (32 octets) – Minimum key length for the recommended strong cryptographic message digests in 2004.
512 bits (64 octets) – Maximum key length for the standard strong cryptographic message digests in 2004.

1,024 bits (210 bits, 128 octets) – One kibibit.
1,288 bits – Approximate maximum capacity of a standard Magnetic stripe card.
4,096 bits (212 bits, 512 octets) – Typical sector size, and minimum space allocation unit on computer storage volumes, with most file systems.
4,704 bits (588 octets) – Uncompressed single-channel frame length in standard MPEG audio (75 frames per second and per channel), with medium quality 8-bit sampling at 44,100 Hz (or 16-bit sampling at 22,050 Hz).
8,000 bits (103 octets) – One kilooctet.
8,192 bits (213 bits, 1,024 octets) – One kibioctet.
9,408 bits (1,176 octets) – Uncompressed single-channel frame length in standard MPEG audio (75 frames per second and per channel), with standard 16-bit sampling at 44,100 Hz.

15,350 bits – one screen of data displayed on an 8-bit monochrome text console (80x24)
20 - 50 kbits – one page of typewritten text (uncompressed, depends on size of type and number of possible glyphs)

1,978,560 bits – A one-page, standard-resolution black-and-white fax (1728 × 1145 pixels).
4,147,200 bits – One frame of uncompressed NTSC DVD video (720 × 480 × 12 bpp Y'CbCr).
4,976,640 bits – One frame of uncompressed PAL DVD video (720 × 576 × 12 bpp Y'CbCr).

11,520,000 bits – Capacity of a lower-resolution computer monitor (as of 2006), 800 × 600 pixels, 24 bpp.
11,796,480 bits – Capacity of a 3.5" floppy disk, colloquially known as 1.44 megabyte but actually 1.44 × 1000 × 1024 bytes.
25 Mbits – Amount of data in a typical color slide.
30,402,457 bits – Size of the largest known Mersenne prime. All of its bits are 1.
46,080,000 bits – Capacity of a high-resolution computer monitor (as of 2006), 1600 × 1200 pixels, 24 bpp.
50–100 megabits – Amount of information in a typical phone book.

150 Mbits – Amount of data in a large foldout map.
423,360,000 bits: A 5-minute-length audio recording, in CDDA quality

5.45×109 bits (650 mebioctets) – Capacity of a regular compact disc.
5.89×109 bits (702 mebioctets) – Capacity of a large regular compact disc.
6.4×109 bits – Capacity of the human genome, 3.2 billion base pairs (each pair counts 2 for 2 bits of data).

4.04×1010 bits (4.7 gigaoctets) – capacity of a single-layer, single-sided DVD.
2.16×1010 bits (2.7 gigabytes) – size of the English Wikipedia without images (Compressed it is 1.1 gibibytes).

1.46×1011 bits (17 gigaoctets) – Capacity of a double-sided, dual-layered DVD.
2.15×1011 bits (25 gigaoctets) – Capacity of a single-sided, single-layered 12 cm Blu-ray disc

1012 bits (125 gigaoctets) – Approximate size of all Wikimedia projects.
1,099,511,627,776 bits (240 bits, more than 137 gigaoctets) – One tebibit.
1.6×1012 bits (200 gigaoctets) – Capacity of a hard disk that would be considered moderately large in 2004.
(approximately) 4.12×1012 bits (515 gibioctets) – As of 2002, data of pi to the largest number of digits ever calculated (1.24 trillion).

1×1013 bits (1.25 teraoctets) – capacity of a human being's functional memory, according to Raymond Kurzweil in The Singularity Is Near, p. 126.

1.5×1014 bits (18.75 teraoctets) – Amount of information in the Library of Congress, if it were all digitized.

2.4×1015 bits (300 teraoctets) – Size of the Internet Archive in 2004.
8,000,000,000,000,000 bits (1015 octets) – One petaoctet

4.5×1016 bits (5.625 petaoctets) – Estimated hard drive space in Google's server farm in 2004.

800,000,000,000,000,000 bits, Data's storage capacity

1.6×1018 bits (200 petaoctets) – Total amount of printed material in the world.

1.8×1022 bits (2.25 zettaoctets) – amount of information which can be stored in 1 gram of DNA