Being a music file nut, I saw this software title and figured it had something to do with sync'ing the Ogg Vorbis sound files. And there was much rejoicing! That wasn't it though, so the rejoicing ended pretty quickly.

OggSync will take your gmail.com account information and synchronize your phone's calendar with your Google Calendar. Very slick setup, and the freeware version works just fine. Not sure what options the registered/paid version does differently.

Download link (CAB download)