I force myself to circuit train at home with free weights and an elliptical/jumprope at least twice a week. While it does not seem to significantly improve my cycling, there are other benefits such as improved upper body strength and better balance in muscle usage.
Currently I'm at 3x8 pull ups, 3x70 crunches, 3x15x30lb curls, 3x30 pushups - somewhat of an improvement from 2 months ago.
By the way, what's a cross trainer?