[ph0rque]

This is what we did in my previous start-up: we wrote up the process of all that we were doing, then researched as much as possible about what kinds of patents already existed in our field, and rewrote what we had to avoid infringing on those. The research was the hardest part, but now http://www.google.com/patents should be a big help. Then, we took what we had to a lawyer and asked him for advice. He ended up helping us file the prov. for less than $400.