I think good blogs are pretty hard to do. Most of us don't solve interesting problems all that often, and blogging about something you read elsewhere isn't very exciting. I pretty much fall into that boat too! I've been blogging for a couple months to see what I could make of it and the answer so far is Im not sure. I've been mixing SQL and user group posts, but out of all of those Im not sure that if someone else was writing it I'd read it directly, though it would have higher value if found as part of a search (due to relevancy only). Blogs work where personal web sites usually fail only because RSS makes it painless to check for new content and it makes loading content super easy.

I do like the idea of a 'professional development' blog that is a lot more like a diary and a lot less about come read what I wrote. One of my fav interview questions is to ask someone what kind of professional development they do to sustain and astonishly few have much of a plan. If you blog about articles you read, some nice tip, etc, it gives you a focus for your blog and conceivably would be helpful to someone following the same path but not quite as far along as you are. It's a great way to keep track of little bits and pieces, and it sure would be nice to have that available for the next job interview.

I agree with Grant that a lot of the 'good stuff' is far more likely to be seen and used when posted as content vs blogged. One thing you might consider is doing an SSC based blog, Steve aggregates all the blogs into one feed (in addition to the standalone blog feed) so it might increase the chances of people seeing it.