'Free-mium,' self-funded models set to gain traction
news.cnet.com
news.cnet.com
Other industries have variations: e.g. semiconductor companies give away complex datasheets and simulation models to give prospective users an idea of what the part can do. Especially when you are offering a distinct or new experience you need to give you prospects some way to appreciate what they can accomplish with your offering.
That said, I generally agree with the big picture about self-funding -- its pretty much in line with what PG said in the recent essay about VCs in this recession.
Otherwise you really have to get a lot of visitors to make decent money.