Real-time streaming activity (bids, unbids, asks, unasks, trades, confirmed trades) from Bitcoin Market now in #bitcoin-market thanks to jgarzik for writing a server, dwdollar for hosting, and nanotube for helping to provide the data in IRC channel. Mt. Gox market real-time activity will come soon as mtgox becomes available after moving/settling in to new country.
Feel free to take advantage of this information service @ freenode #bitcoin-market
Really, dwdollar gets credit for writing the server. I wrote a prototype in Perl, and dwdollar rewrote it in Python.