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Syncing wouldn't do this (OmniFocus doesn't sync as part of MobileMe sync or anything, and doesn't sync itself when it's not running).

Do you perhaps have a Dashboard widget that talks to OmniFocus? If so, that could explain if OmniFocus launches when you activate Dashboard.

Alternatively, if you're invoking the "Send to OmniFocus" Service from Mail or your web browser, etc., that will cause OmniFocus to launch (but presumably it wouldn't be a mystery to you in that case).

Or, if you have a mail rule defined to create OmniFocus actions from certain incoming mail, that would explain it.

Those are the possibilities that come to mind, although it seems to me I've heard of some other process that can cause this, but I can't remember it at the moment (or maybe I'm just imagining it).