since I'm using Asterisk a lot, I'd like to give some pointers that could be useful - but you probably already know all of these:
- web configuration - there is quite interesting project going on for web configuration interface - it is made for newbies - http://amp.coalescentsystems.ca/
Currently it is under heavy development but next release will probably be more than enough for use under Pluto.
I'm suggesting this cause I see Pluto also in Small company environment that has some higher demands on VOIP telephony. Unfotunately it's made for stable version, but it seems like running under HEAD too.
I saw that you're using Asterisk with Realtime for extensions, but there could be some other usefull stuff in AMP, like recording prompts, call routings, ....
- FOP (Flash operator panel) - www.asternic.org
Very useful as operator panel and also as control tool. It has client and server written in Perl & ming and maybe it's good base to do something similar with Pluto floorplans...