How big is the bitcoin community 1st of Feb. 2012? I really do not know what kind of metrics are available for measuring the size of the Bitcoin community, but I am interested in any metrics indicating how many users of Bitcoins that there are. Some example metrics could be:


Number of registered users on forums
Number of wallets
Number of wallets with bitcoins in them
Number of non-mining clients running
Number of installations of default client


It would be excellent to see these numbers in relation to some numbers, like the size of the BitTorrent community (or maybe the old Napster community) or whatever, to get a better understanding of the number, but this is not necessary.
Have a look at:
http://bitcoinstatus.rowit.co.uk/

Nibor on the bitcoinj mailing list has created a whole series of charts about the bitcoin p2p network.