Just stumbled across a fun blog about bad logo design: Your Logo Makes Me Barf. It’s not just about poking fun at bad design; quite often the critiques contain useful advice and explanation (note: they prefer simplicity…). Experienced designers will get a laugh; newcomers will get a useful education and potentially learn to avoid common mistakes.
As long as we’re talking about bad examples, I have to mention the classic Gallerie Abominate: a collection of truly horrendous 3D modeling and animation with matching lowbrow sense of humor. It hasn’t been updated for years, but it doesn’t matter: Unlike some flavor-of-the-month “good” designs, bad design seems to always endure.