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DIY Projector

After seeing how high priced commercial projectors are, I came up with the idea of trying to build my own. After searching the net, I found three main ways that people have achieved it.

1) Using a standard computer monitor or TV
This has been around the longest. There are lots of sights offering plans for a price. You don't need them, you can get them from here free. This is cheap, it works, and you get get quite good resolution, but it's bulky and not very bright.

2) Using a large LCD, normally meant for use on an OHP. You can get these for about US$100. You can get great resolution and get it much brighter than the previous way, but again it's very bulky.

3) Using a small LCD through an old CRT projector lens. This way can be made the smallest, and possibly the brightest, but has a lower resolution if you want to keep the price about the same.

Some Links:

Other DIY Projectors
General Information
Projector using 5" LCD
Horizontal Large LCD Projector
Mirror Based Large LCD Projector
OHP Based Large LCD Projector
BSTV Central - Free plans for using an old TV/Monitor

Lenses
Sphere Research - Surplus optical test equipment
Edmund Scientific - Very Cheap Lens
Surplus Shed - Lots of cheap surplus parts

LCDs
Parts Express - Lots of LCDS
MP3 PLayer Store - 5.6" LCD with PAL/NTSC

Bulbs
Track Lighting - 10,000 Lumen 12V 65Watt Dichoric Halogen Blubs
Lights of America - 7,500 Lumen 75Watt Flourescent Bulbs (LOA)
Bulb Source - Overhead Projector Bulbs

Misc
DScalar - Software, cleans up video outputed from your computer
Home Video Systems Visual Resolution Comparison
Video Projector Links - This guy started the idea on the:
DIY Audio - Message Board, be sure to check out the projector thread
Greenspun Message Board - Not much info here