I'm not sure how many people here are tracking chem+CBC bloodwork, but I had the idea of walking people through the meaning of each of the numbers as I experiment with my own levels. So I made a fairly silly video about creatinine to gauge people's interest, and I'd be curious to hear any feedback.
For a better explanation of the "why's" of tracking this stuff, I like Mike Lustgarten's Quantified Self Boston presentation:
He also has a more in-depth presentation.
For those who aren't using some giant unified tracking system, I find WellnessFX's bloodwork tracker handy. Their site's meant to sell you their testing services, but it's free to use the tracker without buying anything. It has the benefit of giving you a visual sense of your levels and how they sit inside the reference ranges.