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@Dammit
I'm right at the very beginning of training with a power meter, being able to overlay that with heart rate information and cadence is (for me, anyway) very interesting.
I did an hours session last night, and during the warm up phase a quick sprint hit ~750 watts, and my heart rate didn't go beyond 150, then after about 55 minutes of 225W running a couple of quick sprints up to 4-500W saw my heart rate hit 176, and take a long time to settle back to 155 again.
This is only on the turbo, be interested to see what sustained gradients do to heart rate and power.
First interesting thing to come out of it is that I can produce the same power with a heart rate 10 bpm lower if I spin a lower gear faster (than a bigger gear span more slowly).
This is something I kind of always knew, but seeing it for yourself does a good job of convincing you that it is actually true!