Apex PD-660S 6.5-Inch Portable DVD Player
Great little DVD player - may need to calibrate the battery, though
This is a cool little player - I've used it for over a year.  My only complaint is that it doesn't actually display native DVD resolution, so on screen text in movies can be difficult to read.  This thing will play just about any format of DVD except for DVD-RW (+RW works fine, though).  DVD's with MP3's on them play well too. <br /> <br />When you charge the batter, you should not do it while hooked up to the player.  If your battery doesn't work, you can calibrate it by hooking a 12 volt vehicle light bulb to the + and - terminals of the battery over night, and then charging it up to full (leave it plugged in for about 12 hours).  As I used it my battery life went down, but calibrating it (as I mentioned above) got me back up to about 3 hours of life.  <br /> <br />I've also used this attached to a TV using the S-Video, and I have used the option to connect my PS2 to it (very cool!)