Declan,
I love this application for a couple of reasons.
The first is that it looks great (as a mostly admin person who dabbles in coding, you should see how crappy my existing non-xpages phone directory for our company looks).
The second is that I love how you took us thru designing an XPages application step-by-step. Now I might just have a slight clue what I'm doing.
We are a small international manufacturing company (about 200 - 250 users) currently running V8.02 on the servers with V7.02 clients and a V6.51 Sametime server.