I saw the iRiver G10 on Akihabara News. My first thought was the Gizmondo, but I guess I should be a little fair and actually give them a chance to release this device. The iRiver G10 will run on Windows Mobile 5 and will have a WVGA screen (800x480), along with 4 to 8 GB of storage.
It looks like people are comparing this to the PSP and the Nintendo DS, but I seriously doubt that it's on the same level. First, we would need to see what games would be released for it. It's a pretty safe bet that we would see the same caliber games that we see for the DS or the PSP (please, no jokes on the PSP's library of games). The enormous amount of storage is a promising sign, however.....but better suited for viewing movies or television shows.