I've switched to moderating comments on Blogger. Forced by annoying circumstance... but it turns out to be saving me an immense amount of time, because it's easier to read through the comments on Blogger's moderation page than to check them out in the email (and actually finding them all in the posts is impossible). And I've been able to turn off word verification. You wouldn't believe how bad I am at typing in those verification words. (All those double "v"s trying to look like "w"s!)
I hope you enjoy the change, this escape from having to type gibberish, even though it means there may be some delay in getting the comments up.
And here's some advice for avoiding having your comments rejected. Don't use bad language. (I don't mind it myself, but I'm worried about filters.) Don't be abusive. (I'm fine with people disagreeing with me, but if you just want to call me a moron, get your own blog. You can whine about censorship over there too.) Don't try to make the thread be all about you. Don't cut and paste long quotes. And don't bring up subjects that are completely unrelated to the post, unless it's funny or cool or aptly analogous or something else that I happen to appreciate.