These days, Web startups are easier than ever to start — and harder than ever to sell. Carson Systems has apparently found a buyer for DropSend — eight long months after founder Ryan Carson first put the file-sharing Web application up for sale. DropSend has gotten good reviews, but it's in a hotly competitive space, facing rivals as diverse as Pando, Pownce, and YouSendIt, and Carson's conference business appears more promising. (Why bother actually writing Web apps when you can just get people to pay to talk about them?) Anyone know the name of the buyer, and the purchase price?