Google now supports 2-way iCal syncing!! If you didn't catch that, for us Mac people this means:
You can sync multiple calendars, two ways, and have all calendars show on your pocket outlook if you use Missing Sync. Yeah, this means having to connect to a computer, unlike OggSync which does it over the air, but free is free. OggSync free version will only sync one calendar.
I have my Missing Sync 4.0.2 set up to sync 3 cal dav calendars to the phone. The only caveat is that Missing Sync can't download to a caldav calendar, so any appointments i enter into my phone go into another calendar in iCal, and then I just drag and drop'em into the caldav calendar of my choice from within iCal.
And yes, you can find The Missing Sync 4.0.2 as a torrent with a patch to remove the registration requirement - sorry, no links, that's a warez. Google is your friend.
Note: don't try syncing with both missing sync and OggSync - it'll duplicate your calendars, even if you only ask it to upload. It does not recognize the categories on Pocket Outlook and will re-upload all your appointments to google calendar that you just synced from iCal via cal dav. Learned the hard way.