We found a fun site called Tupalo that "is a social word of mouth recommendations network for fans of local culture, mom and pop boutiques and things that make you go "hmm"."
It also turns out that they are well up the web 2.0 curve and have integrated to Twitter . You can Tweet from within a location page on their site now..
"Heading out to lunch and want to let your Twitter friends know where to meet you? Now you can simply visit a location page to quickly and easily send a tweet to your friends list. Simply find the location you're heading to on Tupalo, click the "Twitter It" button, enter your username and password and off you go. We'll pre-fill a simple message, which you can easily edit and send. All of your friends on Twitter will receive a nice little tweet from you with the name and URL of the location you're heading to. Look below to see a screenshot of our hot little Twitter form, simple no?"