Data Formats

Almost Every File Format in the World - Names many file formats and their extensions.
www.ace.net.nz/tech/TechFileFormat.html

DaubNET File Format Collection - The full specifications of various file formats.
www.daubnet.com/formats/

Dot What?! - Database of file extension information. Supports users comments and submissions. Includes discussion forum.
www.dotwhat.net/

FileInfo.net - Database of file extensions with information about each file type.
www.fileinfo.net/

FILExt - Searchable database of file extensions for data formats, with information and notes on each.
filext.com/

Macintosh Type/Creator Database - A database of windows file extension codes with correlating Macintosh Type/Creator code pairs.
homepage.mac.com/tcdb/

Webopedia - Data Formats - Contains information about many data formats.
webopedia.com/Data/Data_Formats/

Wotsit's Format - Detailed file formats and data formats for programmers. A large collection of programming resources with detailed information.
www.wotsit.org/