I second Local Harvest (and check out the grocery store)! Also, we love Schlafly's BottleWorks in Maplewood--Local/seasonal ingredients, kitchen garden out back, Microbrew beer, and super kid-friendly!
Riddles Penultimate Cafe in the loop has always used local, seasonal foods and has a fabulous wine list!
Ok, that's it for now. If I think of others I'll send them your way. We love local restaurants with locally grown food, so we're always hunting them down to give them a try!
Juliette