If you feel like your SW has actual value and charge for it, but Google has you in their cross hairs, you either really need a great product (that can't easily be cloned) or very strong network effects.
While I think DropBox is a great product, and harder to clone that most people give it credit for, Google I think is the type of company that could actually nail a DropBox clone. And with GMail, Docs, and Android integration -- could be a serious force.
I must admit I'm a bit saddened that the actual value of so much good SW is ~$0.