350 downloads doesn't seem much for a site that has this much traffic, so i wouldn't be so sure about somebody direct-linking -- why not check your referrer logs? you can see where people come from then. and if you really hate it, a little code can prevent it. it's pretty normal that the number of downloads is vastly greater than the number of thank-yous; witness viewings vs comments in the galleries. most people just don't say anything. thank you for the great freebie!