My average speed so far this year (road bike only, not including commutes): 23.66 km/h.

Last year (2006): 24.01

The year before (2005): 23.55

I am not interested in my speed in miles but you can get the conversion here: http://www.google.ca/search?hl=en&q=...e+Search&meta=

That includes club rides, leisurely rides, rides with strong and less strong friends, stopping and starting, very flat and verrrrrrry steep.

And it's really not very important.