Cool app - some ideas for the future.
A few improvement ideas...
Integration with the phones address book. No one wants to have to remember emails or phone numbers and it's especially difficult to do when your trying to start a meeting from your mobile. Full integration with the devices phone book so with a couple of clicks you can select a person would be helpful.
Calendar integration would be good too. That way you could set up an easy meet and have the phone's reminder go off and possibly launch the app from that.
Uploading files from the mobile - a thumbnail view would be better for selecting pictures off the phone - it's really hard to know what file you need to upload is when it's just numbers (i.e. 2009031002.jpg etc).
How about from the meeting, the ability to activate the phones camera and snap an image directly into the meeting.
Optimise viewing for the devices screen size - viewing on the N95 you have to scroll around in full screen mode. Maybe some improvements in scaling.
Text chat from the phone is a bit painful if you don't have a qwerty keyboard. How about VOIP capabilities - although a huge one to implement.
It's a great start though. I can see with a few tweaks it being a really handy little app to have when you're out and about.