I've tryed 2 softwares that I found for this: This OggSync and GMobileSync (this last freeware).
The first one doesn't recognize my account, I put my e-mail and password and it says that thei're wrong, but thei're not.
Gmobilesync connects to the account, but when starts to sync, it shows an error message:
"Please report this error: execution of request failed:
http://www.gmail.com/calendar/feeds/...ull?start-min= (... and it goes with date info)
I have 2 calendars on my account, is this why?