Hulu doesn't like single core processors. I tried it on my Pentium M 2.4 Ghz laptop and it stuttered something fierce. Hulu runs fine on my 1.8 Ghz dual core lappy, my 2.4 dual core lappy,my AMD x2 3800+, my FX 60 @ 3Ghz, and my i7 of course.
The xbox plays divix, avi, mpeg, and wmv. I use Vader's transcoder to stream vob files to it in WMC as it functions transparently. But it converts the vobs to mpegs on the fly so slower processors will have to buffer for a bit before playback. Also orb works to transcode on the fly and I've heard good things about PS3 media server. You should check out these programs and see how well your computers do.
The xbox plays divix, avi, mpeg, and wmv. I use Vader's transcoder to stream vob files to it in WMC as it functions transparently. But it converts the vobs to mpegs on the fly so slower processors will have to buffer for a bit before playback. Also orb works to transcode on the fly and I've heard good things about PS3 media server. You should check out these programs and see how well your computers do.