How to import Contacts from old Sony Ericsson C702 to Xperia X10? How can I import contacts from non-android phone?

Are there dedicated applications?

What I want to avoid is doubling contacts when moving them from old phone to SIM card and then to new phone.

Any suggestions?
I have no prior experience with Sony Erricsson software, but I think their PC Suite solution (found here) deals with the syncing of Contacts etc.