I tried maintaining a professional blog but I found I didn't have something to say often enough to make it worth it. Instead, when I've got something I really want to share, I write it up & submit it to you guys as an article. I get more readers than I'd ever get on a blog and, in terms of a resume, it looks pretty good to say you're published as opposed to saying you run a blog.
"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
- Theodore Roosevelt
Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning