One of my favorite services. I use Foursquare daily, I might not always use the app, but the service is there ready when I need a recommendation. Great for finding local places near home and when I'm in new cities.
I built this app to help Foursquare Superusers manage venues. It allows editing/flagging and relocating venues. This tool works based on your superuser level, even if you aren't a superuser, your edits will be submitted for review.
Not one of the prettiest apps out there, but it gets the job done. It scans local venues for wifi password within their tips. If you find a new spot that doesn't have the password posted (if they don't mind) you can post it with the app for others.