I don't get the infatuation with the Mini, myself...it's really pretty much just an iMac G4 minus the art deco lamp case, and frankly the iMac G4 is no great shakes in anything other than the aesthetics department as it is. Power Mac G4s can be had for chump change (or less, if you make a lucky find at your local recycle center,) any of them will best a similarly-clocked iMac/Mini, later models are commonly available in dual-CPU configurations, and they're infinitely more expandable. Unless you're extremely strained for desk space, I don't see why the Mini is worth the bother.
Macmini is quieter (even after replacing the MDDs fans with ultraquiet ones), has lower power consumption (important when ~always-on), and a smaller footprint (sits next to the TV nicely without taking up half the room).
Downside is that the audio sucks, at least on mine (loads of interference from usb, graphics operations, network transfers). I still find it frustrating that we don't have isochronous transfers over USB just for this reason.
