I blogged about this application a week or so ago, and have not got it up and running on my phone. You can see the icon in the sidebar on the right that tells you where I am and whether my phone is on or not. If you have a nokia series 60 2nd edition phone download it and give it a try, it would be cool to have more of my friends connected through this kind of rich presence information.
Update: One of the developers got in touch with me via this posting, they sound very responsive and are definitely taking the application in the right direction.
My biggest concern at the moment is the energy consumption, it kills my 6680 in about 24 hours which for my lifestyle is unusable. The developers are working on this and I am looking forward to the next version.