Mini | This Mac jumps in graphics, hard drive size, but not much more internally.
On the outside Apple is offering one more USB, a mini DVi, and a mini display. There are conflicting reports that this Mini will offer dual monitor support. If it does this could make the Mini the ultimate conferance room machine.
Personally I would get one for the home entertainment room. We currently have a Mini running our DVD collection. The built in bookshelf that holds it has a monitor but it’s currently not hooked up. The Mini is just sending video directly to the 56″ HD TV via a DVI to HDMI cable. Hopefully with a new Mini I can prep videos for playback on one monitor, then move them over to the larger screen for viewing.