I've been trying to feature a blog each month and for April (one day late!) it's Aaron Alton. HOBT stands for 'heap or b-tree' (or Help Order Big Tires?) and I like that Aaron is a fairly consistent poster, averaging 10-12 posts per month that are almost always about SQL, so it's definitely a targeted read. Aaron is also an MVP, so one more reason to take a look at the blog.