ehomeupgrade has a roundup of 4 recently announced digital media servers:
AL Tech Mediagate MG-25: 25GB 2.5″ hard drive, supports MPEG4, DivX, XviD, OGG, MP3, WMA, and JPEG, USB 2.0 connectivity, up to 1080i HDTV output.
DTS Infocom MODIX HD-3510: up to 400GB 3.5″ hard drive, support for MPEG4, DivX, XviD, MP3, and JPEG, up to 1080i HDTV output.
Dvico TViX: up to 250GB 3.5″ hard drive, supports VOB, DivX, XviD, AVI, MPG, DAT, PCM, MP3, OGG, WMA, AC3, and DTS, HDTV output.
FIA On3 Pro Digital Media Player and Library: up to 120GB 2.5″ hard drive, supports MPEG4, DivX, XviD, MOV, AVI, MP3, OGG, WAV, and AC3, HDTV output.