So I've been looking at data from the Powertap.
Comparing this season to previous data going back to 2007.
This season, peak power for 1 hour was 198 watts.
Previously, in 2007 I set a peak of 178 watts for the same duration.
A 10% increase in performance since the year I completed PBP.
It's also interesting that basically what appears to have happened is the point where my performance drops seems to have shifted.
i.e. the curves are similar up to about a half hour's duration but then they diverge. The previous years' curve drops away faster then levels off a bit. This year's curve stays flat for longer, to over an hour before it drops away again (thus the difference closes a bit over very long durations to about 12 watts).
At this point in 2008 I was worse over 1h than in 2007 (170W, so I am much faster now than a year ago it seems). At the widest point the gap is 30 Watts! Perhaps an artifact of doing lots of long events? I don't have much data for the main part of the 2008 season as it was playing up (replaced under warranty).
Many of the highest long-duration data points were on the MSG 300 funnily enough.