That's a timely reminder -- our plans were to release OCS 2.3.3-1 and designate it stable once it had a few weeks for anything unexpected to shake out. We've been using OCS 2.3.3-1 at production level here at SFU for quite some time with good results.
So yes, it's time to designate OCS 2.3.3-1 as a stable release.
Incidentally, we've started tracking recommended patches for each new version; see http://pkp.sfu.ca/wiki/index.php/OCS_Recommended_Patches
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Public Knowledge Project Team