Based on about an hour of usage, Unclutter is my favorite -- nudging out my current tool-of-choice (Tranquility!). Great job.
I would obviously like for you to continue development. Having said that, I have no great monetization advice. Nor do I even have any burning desire for new features. While I would expect to make progress on the latter, the money thing will be tough.
Some thoughts on money: Since I'm a power user of this type of software, I might pay $10/yr or so for Unclutter. But I have been told that such a low price do not a business model make. I think that your tool is squeezed between the "it's a vitamin" and "lots of good free options exist" pincers. As a sidenote, social features don't appeal to me.
Whatever you decide, I wish you luck. I'm on Firefox/Mac BTW.