If you visited my site within the last few weeks you may have noticed it was down. I recently switched hosts. I took advantage of several hosts' money-back guarantees to take them for a test-drive. I assumed that most of them would be good, and better than my old host. What's interesting is that I ran into a lot of problems - even with the big-name hosts.
I took a few days to run some performance tests, and I uploaded all my content so that I could thoroughly evaluate all of them. I decided to publish my results because I had a hard time finding quality webhost reviews out there that compared hosts head-to-head.
I ended up being a little wordy (for the sake of complete disclosure). So if you just want to skip to the end - there's some great performance graphs and comparison charts down there.