Developer-Test, Tester-Developer
Jeffery Palermo has a post on "(good) developers test so do testers develop?". My take on this is that most testers can't avoid writing code because a lot of testing requires customization (and even creation) of tools to meet your testing requirements. The amount of tweaking requires often requires you write code, any tester that does'nt go to these lengths either has a very rigid, static system to test or is uneffective at automating their testing. Microsoft and Google are mentioned in the posts and the fact there testing postions need coding ability and an understanding of code to test.
I also noticed in the comments of one post that Jason Huggins has been hired at Google (which continues the recent trend at Google for hiring free and OSS test tool engineers) for those of you that don't know him he founded the Selenium functional web testing tool project at ThoughtWorks.