kworld PCtoTV KW SA235 VGA to Composite S Video Converter USB Powered NTSC PAL
The little kworld KW-SA235 does the trick without drivers or extra power bricks. It pulls 5 V straight off a USB port, takes a standard VGA feed up to 1024 × 768 @ 75 Hz, and spits it out in NTSC or PAL over yellow-RCA or 4-pin S-Video.