Stonyfield Organics has partnered with Whole Foods to recycle plastic #5s. This is mostly what yogurt cups are. The "Gimme 5" locations are listed here, there are none near where I live, but hopefully you'll have better luck. At the rate we eat yogurt, we throw away alot of 5s!!
Also, while you're at both Stonyfield and Whole Foods' sites, be sure to look for coupons and healthy recipes!