How to move phone contacts to Google?

I'm using the Samsung Vibrant, T-Mobile's variant of the Galaxy S, running Android 2.1. When I create a contact on my Android phone, I can choose to store it to the SIM, the phone, or to Google. If I choose phone, is there an easy way that I can move or copy that contact to Google (so it shows up in Gmail, for example) at some later time? The edit menu for contacts shows options for _Edit_, _Delete_, _Link contact_, _Mark as default_, _Send namecard via_ and _Copy to SIM_.