If you're not suffering from flashmob proposal overload, here's one more, posted to YouTube almost a month ago. Jimmy asks Aileen to marry him, with some help from Janet Jackson.
This one's technically not a flashmob -- it occurs on what looks like a closed-off San Francisco neighborhood street -- but it does involve elaborate surprise choreography that ends with a proposal. Take a look:
Nicely done. This should have waaaay more views! Of all the proposals, this one's my sentimental favorite for the full effect, and the fact that they dance to one of my favorite Janet songs, "Love Will Never Do (Without You)." And they use ribbons. Congratulations to the happy couple! (Thanks, Allen.)