The running and the biking are obviously making a difference. I have noticed within the last week that I can run a mile one minute faster than I could previously and maintain that pace for the duration of my 3 mile runs. If I could maintain that pace for the full marathon I would blow the 4 hour mark away - I don't expect that, but it's fun to imagine.
I also noticed this morning that riding to work is easier than it was last week. With Thanksgiving I did not go to work for nearly a week. When I rode in to work this morning I was able to put the bike in top gear and maintain a much faster pace the whole way than I had been able to. I learned something very important, when riding at that faster pace in these winter months I need to wear a hat (besides the helmet) and a heavier coat to mitigate the wind chill factor.
It's nice to see improvement after only a couple of months.