And on a somewhat different sub-topic:
For those who say the Cross training doesn't work, I did the 105km ride of the falling leaves last weekend, with my only training on the bike being my 10km commute and a couple of 20km extensions to it in 6 weeks, the only other ride this year being 45 km. However, I've been keeping the running going with a 7-10km run at least once a week.
I kept up with the faster riders until the hills kicked in, then waited for my supposedly more cycling fit friend and dragged him round the rest of the course, feeling that I could have easily knocked 15 mins off my time. I felt rather better than I had a right to, given how little time I've spent on the bike. So Cross training works for me, but then I'm not training particularly hard at any one discipline.