Although it's definitely not as high tech as the Mbox, I recently bought a couple of the Norcent DP300 type dvd players. They are quite nice since they use a DVD rom IDE drive. Most AE and HE111 series have flashable firmware. There's a lot of information here:
I'm not sure how the availability in the States is like, but in Canada, these units sell at Walmart for $87 CDN. The JE series isn't hackable yet I believe, but people have released various firmware "upgrades" the other series. Some have hidden menus where you can disable the region code and macrovision. This Mbox looks cool since it has Divx capabilities.
i-opener opener laptop notebook computer help
drivers dll free windows dos repair fix linux mac macintosh 2000 95 98 nt pc
configure hardware software sound video netscape explorer network networking
lan wan software cmos fat bios printer card mouse modem ide scsi cd rom
controllers scanner tape hard drive cgi scripts source code mp3