I originally was using Move! Bike Computer (it's a free one on the Market) It is very customizable with a bunch of different functions (url for it is https://market.android.com/details?i...Computer&hl=en)

I also got AllSportsGPS from Amazon (free app of the day) and find I don't use it all that much. Though I plan on (eventually) getting a handle bar mount for my Driod X. I suppose that I'll use these more often when I get such. I don't use anything for candence or HRM with my phone. So, those features aren't such an issue with me.