[Hayl]

Is there a way to make Omnifocus sync automatically with iCal, say every hour or something?

[snarke]

Well, here's one way. Save this applescript as an application, and have it launch when you log in:

repeat
    delay 3600 -- in seconds
    tell application "OmniFocus" to ical_synchronize
end repeat

Invoking it with cron or launchd, or using the idle handler, is left as an exercise to the reader.