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Yeah I know; I am/was just excited by all the data ;)
That's how I use my PowerTap. I'm in the 'getting fit again' stage and gathering data whilst I do that. I'm a long way off specific training targeting my weaknesses, especially as I have ~15kg to lose. Small increases in the numbers (especially as weight goes down) helps keep me motivated. Most of my data comes from commuting or laps of Richmond Park.
As others have said, don't compare raw Watts, only compare W/kg. The chart in Coggan is good, it's also here: http://cyclingtips.com.au/wp-content/uploads/2009/07/powerprofiling.jpg
I was scraping into mid/high Cat 4 back in 2009 when I was doing lots of Audaxing and I was just starting to make improvements using interval training (5x5 mainly) as I had access to a gym bike at work with consistent power measurement.
Greenbank-
This is a bit misleading - it depends what you are training for.
Track, TT or flat circuit racing - watts and aerodynamics are the key factors.
Watts/kg is useful for making a profile but it's a bit like BMI in that it can be a bit misleading. Aside from weight, it also only takes 5s, 1min, 5min and ftp power into account so it's not a totally comprehensive review.
dan
Yeah I know; I am/was just excited by all the data ;)
I am glad I got P2M instead of aero wheels.