From the website:
10gen is pleased to announce the first MongoDB developer blog contest of 2011. We’ll be announcing the contest categories at the beginning of each month, and the 10gen engineering team will pick the winner. We hope that these contests will be a way for developers to share their experiences with MongoDB and learn from one another. And we are giving away some pretty cool prizes 🙂 This month we’re teaming up with (mt) Media Temple, who is offering free hosting to the winner.
Check out the blog for the March contest.
Could be a good way to get some PR for topic maps, your project, not to mention yourself.