Just registered on the site to get a license key for Screenshot Captor (which btw is the best capture program I've ever used), got it, entered it and everything worked OK.
I think you guys are taking the right path with this donation system, we usually take things for granted and sometimes need a little push to help a fellow man who does something for us. So stick with this despite the occasional rant from ungrateful people. I currently am in a position where I can't make a donation but hopefully in 6 months when the free key expires I will be able to make a donation.
So thank you for a solid piece of software, it's really appreciated.