A few hours after getting hold of a T-Mobile G1 I was faced with the problem of copying all of my contacts from my Nokia to the new G1 so I started googleing. I spent some time finding a tool that would do this for me but I didn't find one complete solution that would work (granted, my searching skills aren't the best). So (as a good little programmer) I wrote my own.
If anybody should face the same situation as I did, maybe my little app will be of some use... I wrote a blog entry on how to use it (and the download link is there too):