I liked it - why was it discontined and what else do you use?
Google Analytics is all I have to fall back on for now.
I had SiteCatalyst Netaverages as a free subscription ending a few days ago. I didn't realize it was cancelled for everyone though. I liked it a lot.
There's a monthly, or maybe quarterly survey that Adobe produces about browser share directly (I think), and of course Google and Microsoft track it, though nothing is as good as SiteCataliyst, as far as being impartial (and free). I will miss it.