I have about 150 blogs in my reader. Some are great, some average, some are just data mines. So I don't understand it when suddenly everyone thinks it's hilarious to start lying about what's going on.
Yes, that's right. If you pull an April Fools joke, you're really just lying to your friends (and readers in the case of a blog).
It's not funny, it's annoying. You don't have to come up with some crazy nonsense post for me to read your blog - I'd rather you just didn't post that day.
Save your jokes for open mic night. At the very least, be up front that it's a joke. Don't let some gullible fool stumble onto your writing and think "AMG THIS IS THE GREATEST NEWS EVAH!".