I seem to remember that I suggested voting down people who don't do enough for cycling at the ballot box, and punishing the SNP by voting down the referendum, but that proved controversial even on CCE...
I've had an idea for a long time for a website that would target politicians on an individual basis by identifying and highlighting the tactical votes most likely to punish them at the relevant elections.
As the number of riders grows you might expect there to be a tangible 'cycling vote' that could push its weight around.
Ideally you'd need someone at each polling station highlighting who the "cyclists' choice" is though, and I can just see it getting terribly messy...