Don't you expect Apple to be leading edge, not trailing edge?
You know people keep complaining about this but the way I see it is that 1080p is a small market (mostly US) at this time and not mainstream at all. Hell, my DVD player (which is fairly new) is not 1080p.
The "people complaining" are only those who've seen 720 and 1080 formats side-by-side....
"True HD" (1080p) seems to be the future of television - at least from what I saw at CES in Las Vegas. A year from now, expect it to be firmly in the mainstream.
Like the Apple Phone's use of EDGE instead of HSDPA for internet access, the Apple TV's lack of support for 1080i or 1080p is giving you yesterday's technology - tomorrow.
Here's a DMA (Digital Media Adapter) from D-Link (
http://www.dlink.com/products/?sec=0&pid=438) - it has 1080i and supports WMV/MPEG1/MPEG2/MPEG4/XviD/AVI video, audio MP3/WAV/AIFF/WMA/OggVorbis. (Five other DMAs from D-Link at
http://www.dlink.com/products/category.asp?cid=127&sec=0)
Here's a
Netgear 1080p DMA that's coming soon. Here's a
Buffalo LinkTheatre with 1080i, builtin progressive scan DVD player, and support for many video (DAT, MPG, MPE, MPEG, M2V, M1V, VOB, AVI, ASF, DIVX, DIVX HD, XVID, RMP4, MP4, VRO, M4V, M2P, HNL, WMV, WMV HD) and audio (MP3, MP2, OGG, WAV, AAC, WMA, PLS, M4A, AC3, MP1, MPA, ASF, M3U) formats.
(Note - some of the pages on this device say 720p, others say 720p and 1080i)
If you want to learn about how these devices automatically discover and catalog media files on your home network, see the DLNA pages at
http://www.dlna.org/en/consumer/learn/technology/ .