I like the fact that it has HDMI output and comes with XP Prof downgrade rights.
http://www.newegg.com/Product/Product.aspx?Item=N82E16883103215
But I did hear some mixed reviews of Acer quality overall.
I would run XBMC (xbox media center) on it - typically to play DivX/XviD compressed movies.
As far as CPU performance, if that dual-core celeron turns out to be a stinker, I think I can upgrade to a Core2Duo (LGA 775 socket). Here are the specs of the motherboard:
http://www.nvidia.com/object/mcp_intel_techspecs.html
(it's the GeForce 7100)
Any thoughts?