I've been out of the blogging world for long enough that I'm not even sure whether comment spam is much of problem anymore. Granted, it's only been about 4 months, but a lot can happen in that time. For me, like I said, that was one of the big issues in keeping me from blogging. I just got so tired of cleaning out the comment spam every morning, not to mention how disgusting it is to see penis enlargers, among other things, for sale on a site that I know my Mom (and probably your mom) reads on a daily basis.
All that to say that I think I've found a few tricks for limiting the spam. At this point, unless someone builds a spam bot specifically for my blog, then I don't expect they'll be getting through. And if they do, then I'll find another workaround. If you're interested in getting more details about what changes I've made, just drop me an email and I can fill you in.