I use SportTracks to log my rides. Because I use a Garmin, I can upload all my data directly, but they do have a manual entry feature that allows me to enter workouts I do at the gym. Its a great program but it isn't web-based; which is probably why it works so well.
Started using Training Log for Running, Cycling, and Triathlon | dailymile to track my riding. It has the capability of pulling my rides directly from my Garmin and I used a seemless widget to attach to my blog so you can see how many miles I have ridden YTD, how far my last ride was, and my comments from it. Its pretty cool.
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