I drafted this post in February, meaning to come back and make it more robust, but let's face it, I've been swamped.
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A few things that have caught my eye recently:

Task Ave: This app adds location element to your to do list. So if you need to pick up dry cleaning, the app will push out a reminder when you're nearby.

UnSocial: Connect via your LinkedIn profile, tag yourself, and this app will connect you to business people in your proximity that you'd like to meet.

Intersect: I love storytelling, so this is right up my alley. You enter a location and can post a pic from their and/or tell a story related to that exact location in the world.