Bolt's performance was just off the charts. This was supposed to be a epic battle with Tyson Gay and Asafa Powell. I do think a 9.5 was very possible w/o all the celebrating. The testing has been much more extensive so every body in the track and field universe is hopeful everybody is clean. The sport does not need another scandal.
What the runners do is just astounding. The just finished 10k (6.2 miles for you non metric types) was won in just over 27 minutes. That's about 4 minutes and 20 seconds per mile, or just under 65 seconds per lap for 25 laps. Essentially sprinting for 6 miles.