These charts give you an indication of training load. (top one is 2010, bottom one is 2009) The blue line is CTL- Chronic Training Load- a running average of TSS for the past 42 days. The pink line is ATL- Acute Training load- a running average of TSS for the past 7 days. The yellow line is TSB- Training Stress balance.
I know that some have a low opinion of this data, primarily because it doesnt account for the fatigue caused by life requirements, work, stress, wife, kids, mortgage, weightlifting, running if any, etc.. It's strictly bike induced stress that's given here. Anyway, it looks like in 2009 I didn't really begin to pour on the volume until April.
The PMC chart at the bottom shows you more of 2009- (thru June) I left the cursor one what I consider to be my peak of 2009. The high peak ATL (pink) that is shown indicates the day that I rode down to Ninigret, raced, and then rode home.
At any rate, I really like looking at these charts and getting a good idea of how much "work" is being accomplished (another word which is unpopular for some of you) especially when you can pinpoint your better performances and see the stress levels where you were successful.
I do not consider myself a maven on these matters- I'm learning more every day. I definitely consider myself a fanatik of analyzing the numbers though. it's like a hobby within a hobby.