This is our customer service approach:
1. Answer ALL emails and tweets.
2. Build a support site that is SEO’d and contains all the questions people ask (support.gymu.com).
3. Find our evangelists and love them.
4. Find our haters and love them more than our own mothers.
5. Do whatever it takes to fix a customer’s problem, even if that means meeting them to give them pre-release code!
via blog.gymfu.com
We try to do the same at Posterous. When you can't even get a response from other services, we'll try to get back to you within 12 hours or less.