My colleague at Google, Ken Russell, has just posted a very in-depth recounting of how he tracked down a fairly tricky WebGL bug in Chrome's WebKit port after I had identified that creation of Web Workers was causing WebGL resources (and a lot of other resources too!) to leak. It's a very technical read that involves lots of C++, gdb, and stack traces but if that's the kind of thing you're into it's a pretty interesting tale. Take a look!
Graphics Prose - Debugging a Resource Leak in WebKit