Good pragmatic review
I'm sure you will get a few comments from people with one of more of each of the devices ... so here is one to start it off from a Logitech Squeezebox user - focussing on the internet radio part.
The comments about BBC listening might be off-putting to a UK audience. In fact, the Squeezebox can play BBC stations. Out of the box it is able to access the BBC WMA stream (look under Internet Radio/Staff Picks) - or go via SqueezeNetwork.
But one of the big benefits of the open approach taken by them (well - SlimDevices really) is that the community has built a lot of free add-ins.
One of them, AlienBBC, adds menu items for all of the BBC local radio stations PLUS the BBC Listen Again content.
There are numerous other facilities built-in - one in particular that might interest music fans is the extensive support for last.fm - you can "scrobble" what you play and also tune in to last.fm stations. If that means nothing to readers - then take a look around http://last.fm
Also you might like to take a look at the newly released Squeezebox Boombox. Same underlying capabilities - but with built-in amp and speakers (and smple remote). Similar in concept to the Roku Soundbridge Radio. Maybe you could compare them with some of the all-in-1 products from companies such as Roberts, AE, Revo, Pure (new), Intempo (new model on the way).
See also my blog for some extra thoughts
http://dabdig.blogspot.com