A Thoughtworker who is with my group was saddened to find out that, for some reason, Google Code is blocked by our corporate firewall. I suggested that, in addition to the usual suspects, he check out the software at TopCoder.com.
There are more components and apps written for Java, but the .NEt world is well represented on that site.
I have also heard that some of the financial companies are starting to recruit from TopCoder. It's a good way of examining a candidates coding technique and architectural insight. It's a better way of screening a candidate, rather than going through the same old "Describe Polymorphism to Me" questions.
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