I get about 50 spam comments a day. The built-in spam rules along with the Akismet mod do a great job of catching 98% of the spam comments. One or two a day tend to sneak through, but it isn't a big deal to manually delete those. I tend to get one or two false positives a week as well. Because I am a polite fellow I hate to think that someone has taken the time to comment here only to have that comment thrown into spam hell, never be seen again. So I end up spending a few minutes a day (or several minutes if I let them pile up for a week) browsing through the comments marked as spam to make sure that no "real" comments got thrown in there my mistake. I've done that faithfully for quite some time and each time I do it I tell myself that I really need to implement a CAPTCHA system.
Today I told myself that there is no better day than Today! I finally bit the bullet and implemented Dave Burke's CAPTCHA mod on this blog's comment forms. I figure that between Dave's CAPTCHA system and the Community Server spam rules I may never have to shuffle through spam comments again. Thanks, Dave and thanks, Community Server!