Charlie Poole finally has a blog. Charlie is the primary maintainer and caretaker of NUnit for quite some time now, and it's great to finally be able to read his thoughts and comment on them, rather than doing so on a mailing-list basis.
I'd recommend anyone interested in Agile, XP, Unit testing and test driven development to read his blog. Hopefully - he'll keep it up (and from my experience - the more you realize someone actually reads your blog, the more you'll maintain it)
His first real post talks about slow-vs. fast unit tests (i.e integration tests?) and starts an interesting discussion correlating them to user stories and costs in an XP project. I'd have to sleep on that thought a little, but it sure is interesting.