I have just started my attempts to run (walk/run intervals). If I bike, it's after (of course it's either the stationary bike or spinning). My bike is currently at my parents house. There's a guy at my gym that runs and he uses the stationary bike after his runs. A group of about 4 women run a few days a week. They use the spinning bikes once a week in cross training.
This link might help: www.sparkpeople.com/blog/blog.asp?post=cro