Of course the Syrian rebels are being supplied by other countries. If they weren't, they would have been crushed long ago by two professional armies (Syria & Hezbollah) who are sure as hell being 110% supported by outside nations as well.
I posted this New York Times piece on the subject (Croatia-to-Saudis-to-rebels pipeline) a few days ago, but that thread quickly degraded into conspiracy theory crap so here it is again:
http://www.nytimes.com/2013/02/26/wo...-in-syria.html
Granted the Saudis probably were "permitted" to do this by the USA for the time being, but that's no different than any other world or regional powers wanting to protect their interests in the area. Russia & Iran are supplying Assad & Hezbollah far more than the Sunni nations and the West are supplying the rebels. Now, if half the rebels weren't asshole Islamists that equation might change, but they appear to be there to stay.
This is actually one rare case where *so far* the USA has shown restraint, probably because they blew their wad with two other wasteful & costly wars not long ago.