FWIW- Popular science just had an overview of HTPCs with some reviews. Nothing
really in depth, but a nice multipage overview of them just the same.
I just did a quick search of their website:
Build your own HTPC overview
and
more detail
Finally, the article I was talking about above:
The PopSci Buyer's Guide: Media Center PCs. On that page, make sure you follow the links on the left side to "related articles"....
that's where they review specific desktops, laptops and "living room friendly" PCs...