Video capture

Capture your screenshot using any low-cost capture board you may have (including the sub-$50 WinTV series of cards, or the built-in capture abilities of most ATI video cards) and save it as a JPEG. Works like a charm. In fact, it's pretty easy to do. Here's some handy capture tips for anyone willing to give this a try:
 * Don't go overboard on a capture card: Any cheap card (or videocard with built-in capture) that can capture 640x480 at as little as 10 frames per second (30 is best) to a hard drive is more than acceptable for capturing still shots.
 * Capture an entire session, then go through it later for the frame(s) you want. Don't try to capture individual frames while you're playing -- this seriously affects gameplay ;-)
 * If there's a lot of motion in the scene and you see "tearing" or "comb" effects due to the interlacing, use a paint program like Adobe Photoshop or JASC Paint Shop Pro to deinterlace the frame. (Pick either one field or the other, but don't blend them both together or you might end up with a blurry mess)
 * If you have a choice between an RF TV adapter and (RCA jack) composite hookups between your capture card and your video source, choose the composite. If you have a choice between Composite and S-Video, totally go with the S-Video connection as it nearly eliminates color bleeding.
 * If an emulator exists for the console platform that works very well (ie Bleem for the Playstation), it is acceptable -- and easier -- to use that instead of trying to capture them yourself.