By far the coolest & smartest host provider I've seen in a while is Mythic Beasts. They are a host provider in the UK that are pretty much focused on dedicated + colo hosting of Mac Mini's! Talk about being green about your servers, that's a great idea if you require a dedicated server but don't really need the full power of a 1U rack server (mostly lots of memory and RAID).
I'm tempted to switch my hosting over there since my needs are little but I've switched hosts enough for work and play... this VPS through TekTonic is technically "Green" so I think I'll stay right here, unless THEY start offering very cheap mac mini hosting!
An article about Mythic-Beasts:
http://www.freesoftwaremagazine.com/articles/mythic_beasts_02
