With the assault on Bitcoin imminent, redundancy in exchanges is critical.
1) Canada gets its first exchange! https://www.cavirtex.com/ (other resources for Canadians)
2) Another new exchange: https://www.tradehill.com (register now and get a 10% lifetime discount on commission)
3) Gavin Andersen (technical lead) on ABC Australia
4) Mt.Gox Day trading platform
5) Not earning enough mining? Earn BTC for cracking hashes.