CYBERHOME CH-LDV 700B 7-Inch Widescreen Portable DVD Player
For the money, we're satisfied
We've had my 7-year-old daughter's portable DVD player since July '04 and it works fine.  It gets pretty regular use, mostly using the power cord or the car adapter.  We get several hours of playing time with the battery.  You do have to follow the directions and remove the battery when you're not using it or the charge will drain.  The sound volume through the speakers is okay, but the quality isn't great.  Much better through headphones, which is usually how she uses it anyway.