Bitcoin Exchanges & Financial Institutions (and some of the defunct ones)
Exchanges
Coinlab.com - US domestic exchange
FastCash4Bitcoins.com - US domestic exchange for Bitcoin
LocalBitcoins.com - Buy and sell Bitcoin locally
Mt. Gox - Originally a Magic the Gathering Online Exchange, this online market has since morphed into the world’s largest Bitcoin to/from fiat currency exchange. Mt. Gox was subjected to a notorious hack early in Bitcoin’s history which crashed the economy for months.
Virwox - Currency exchanges based around Linden Labs' Second Life - where it is possible to exhcange PayPal for Bitcoin (via SLL's)
Financial Institutions
Btcjam.com - Peer to peer, Bitcoin lending, project funding & crowdsourcing (seems to be ridden with scamsters, unfortunately)
Bitfunder.com - A Bitcoin stock exchange, open 24/7
Coinlenders.com - Interest bearing deposit accounts, run by a reputable member of the community
Cryptostocks.com - Another Bitcoin based stock exchange
btct.co - A US based stock exchange, which may limit its longevity
