There is much speculation about what Israel was doing when it conducted an air raid in Syria 12 days ago. Some suspect that it was to bomb shipments of arms to Hezbollah, but if that was the case, why wouldn't Israel have loudly advertised that fact? Others suspect that it was a dry run for an attack on Iran, but if so, why would the Syrians have been so quiet about it? If anything, the Syrian reaction to the raid has been muted, an atypical response for a generally aggressive regime.
Bret Stephens has a fascinating piece in today's Wall Street Journal speculating that the most likely scenario was that the IDF was raiding Syrian nuclear facilities: http://www.opinionjournal.com/columnists/bstephens/?id=110010619. I suppose that over time, the truth will come out. It will be interesting to find out what Israel was really doing.
UPDATE (9:25 a.m.): For a thorough analysis which sounds likes it comes from someone in the intelligence community, go here: http://formerspook.blogspot.com/2007/09/new-details.html.