Now go outside and look at the sky.
Good Logos, Bad Logos
GoodLogo!com has a large collection of corporate logos and users can vote on them, Hot-Or-Not style.
It's an interesting experience to vote on these logos - we see them all the time, but we usually never take the time to actually look at them. Our brain keeps this kind of stuff close at hand for everyday pattern recognition and it is almost a shock to look at these logos closely and to realize how good/bad some of them are.
My personal favorite - Atari - is currently at #3, surrounded by the old Apple logo (rainbow-colored) at #4 and the new Apple logo (glassy) at #2. All other logos in the computers category are pretty mediocre...