While I was in Montreal for the annual summit of the Canadian Green Building Council, I was able to try out the new Bixi bicycle rental system. In the mornings I hopped onto a bike at a Bixi stand near my hotel, biked through town, and parked at the Palais de Congres where the summit was held. At the end of the day I could grab another bike from the Bixi stand and bike right back to the hotel. Trips under 30 minutes are free, so it didn't cost me a cent.
Check out this write-up on the Bixi from Worldchanging Canada:
If you care about cities, sustainable infrastructure, solar energy, life-logging and product-service systems, the Bixi is worth learning about. It is billed as a fourth generation bike sharing system: portable, solar-powered and wireless.