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FlaskMPEG (freeware) - Win
Convert .vob files to .avi. This is a great tool to make videos of your own personal DVDs
http://www.flaskmpeg.net/

FLV Online Converter (browser)
Brought to my attention by Emiliano, this service converts a Flash Video / FLV file (Youtube's movie,etc) to MPEG4 (AVI/MOV/MP4/MP3/3GP) file.
http://vixy.net/flv_converter

HandBrake (freeware) - Mac/Linux
HandBrake is a GPL multiplatform, multithreaded DVD to MPEG-4 ripper/converter.
http://handbrake.m0k.org/

SmartRipper (open source) - Win
SmartRipper is a DVD VOB file extractor (so called "DVD ripper"). The program is loaded with nice features like per-chapter splitting of VOB files, angle processing, etc.
http://www.afterdawn.com/software/video_software/dvd_rippers/smartripper.cfm

Sothink Flash Video Encoder (shareware) - Win
[$45] Convert your videos to Flash video so you can display it on a web site.
http://www.sothink.com/product/flashvideoencoder/index.htm

STOIK Video Converter (freeware/shareware) - Win
[$29 for pro version] STOIK Video Converter is the new release of popular freeware utility which has millions of satisfied users who enjoy power, speed, and simplicity of this versatile instrument.
http://www.stoik.com/products/svc/index.html

Videora iPod Converter (freeware) - Win
Videora Converter is a free video conversion application developed by the creators of Videora. It allows you to convert your regular PC video files (avi, mpeg, etc) into the proper video format.
http://www.videora.com/en-us/Converter/

VIDEOzilla (shareware) - Win
[$29.95] Videozilla is a complete video conversion tool for video files AVI, MPEG, RM, MOV, ASF, WMV, SWF or FLV via a right-click menu on the selected video files.
http://www.videozilla.net/

Zamzar (browser)
Convert any of your files to another format and do it without installing any type of conversion software.
http://www.zamzar.com/