I know this place has been reviewed here on BA, but I've just got to add . . . holy crap! I'm here in Temecula for a month, and I thought I'd check out Baron's just to see what's up, and it turns out this is a serious beer mecca. Tons of awesome, fresh locals (all Stone and Ballast Point, including all BP canned offerings), Pliny, Blind Pig, Parabola, Great Divide (all Yeti formats), etc. Literally 20 cases each of Stone IRS and Espresso IRS. I know it's just a half hour more south to hit Escondido, then SD after that, but if you find yourself here in this part of Inland Empire, Baron's is the shit.
I used to work in Temecula, and yes, Baron's is incredibly awesome. I think I would stop there at least 2-3 times a week. Pliny seems like it is always stocked. I feel like the residents there don't know what they have. There is also another one in Murrieta I believe that is just as good. There's also a small liquor store called Old Town Liquor in Temecula that usually has a great selection of brew. The owner Rick is a great guy and really knows his beer. He doesn't have a selection as big as Baron's, but it's good stuff nonetheless. Check him out if you can.