I like to work the parts of the legs that don't get a lot of work in cycling, e.g., hamstrings. I generally do a 3 day/week full body routine during cycling season. Legs get the most attention on Mondays & Wednesdays.

Here are some websites that can give you some sensible routines:

http://www.billpearl.com/ Click on "programs"

http://forums.jpfitness.com/ They have a section for cycling & lifting questions.

http://www.stumptuous.com/cms/displaysection.php?sid=3 Towards the bottom is Krista's workout routines. The entire website is good, though.