Networking groups give you instant access to potential customers and advocates for your product. If nothing else, they are a good place to express yourself and get comfortable sharing your business. A couple I have been to in the St. Louis area are Yellow Tie and BNI. They each take a little different approach, but I recommend them both. They are always looking for new members and like visitors so check 'em out.
Have you ever been to a networking event? What did you think?