I have a mac at home and a PC at work. Now that Leopard is here, is there an easy way to sync my contacts and calendars between the two? I am a .mac member but I doubt that will help me here. I've been reading a little about LDAP/CalDAV and I assume the answer may rest in those two solutions but the technical goes a little over my head. Are there any cheap or free LDAP/CalDav servers with which I can sync Address Book and iCal on my mac and then a program on the PC that will sync with the server? Right now I'm running Firefox and Lighting on the PC, but I would be open to other programs that may be better suited for this. I would also love to be able to sync Leopard notes and To Do's with the PC but I'll happily start with my contacts and calendars.