I just broke my speed record the other day (although I haven't had a computer for long). 43mph on a mountain bike down the biggest, baddest hill I could find. Couldn't stop at the bottom though and missed my turn off.
I thought I had a contender of a hill today but it was disapointing. 37.5 into a mild head wind
I'm eager to get on a road bike now and break the 45mph barrier, but I don't think I'll be happy until I reach 50. I know a hill that might do it, but I'm not convinced that stopping before the t-junction at the bottom is even possible at those speeds.