Hi,
I'm running Tomcat 6 running a reasonably heavyweight Java app, and it gets about half the throughput per CPU GHz as other highly-tuned x86 boxes I use.
Here's my app at its test URL, somewhat slow, though given that this same app runs on a 24-thread box and other fairly meaty boxes elsewhere, and this is about half the memory and half the CPU power I've ever previously run it on, and all on 2.5W, I'm quite happy with it for now. Be gentle with it please!
http://mirror-uk-ww3.gallery.hd.org/ [updated]
I hope to be getting some static pages running under Apache2 in the next day or so, and you can give them a whirl if you like.
Rgds
Damon