Last night I finally swapped out my Windows+MediaPortal HTPC for a Linux Mint+Boxee one. The benefits, of course, being the on-line content that Boxee brings to the table as well as the ability to use the $20 Vista-only remotes I bought ~3 years ago. I played back some 1080p videos in testing, and... wow. Not a peep from the newer machine (dual core, 2GB, 512MB video). This was a stark contrast to my other HTPC that sounded more like a jet engine than a computer when attempting to play HD content.
So I've been playing with Boxee full time for a week or so, and I've run into just one small issue that... stinks. There is no way to specify a movie vs. a TV show. This becomes a problem when you have a TV show named Ghost Hunters and there is a movie with the same name. Similarly, an episode of Robot Chicken was tagged as Spider Man: Behind The Scenes. For the most part, this isn't an issue. However, it would be nice to re-tag items that are incorrectly tagged. Not a show stopper, but something definitely annoying to the [power] end user.
I have decided to make the switch. Yes, a new media center (or HTPC, if you prefer). I've been a longtime follower and user of MediaPortal, both for its ability to run on different hardware and the quality of the finished project. It has the ability to run a TV "server", and schedule recordings and playback for every MP computer in the house. In addition, it has great plugin support and the quality of the plugins are just as good.