Cool site, im not a coffee drinker, but for those who are, its good stuff.
Strength:
Its great for those who drink starbucks 4 times a day to be able to find a great coffee place right where they are. And its also good that people can add new places, by emailing you.
Weakness:
Adding a new place would be sweet if it was automated, and as soon as someone fills out a form, that the marker shows up on the map. Also, see if you can implement the pictures onto the main page, maybe at the bottom of the map, if someone clicks on a starbucks, then pics of starbucks show up or something.
Overall great job.