Not about price, but dependant on another price is not Free or Open
I think Matt Asay has raised some issues that 'users' of F&OSS are interested in, but two of the most critical points seem to have been missed:
1) F&OSS is NOT about price:
2) F&OSS that depends on non-F&OSS is encumbered:
Large proprietary focussed software companies 'swallowing' open source projects tend to to quickly make the technology dependant on something that is purely proprietary. Long before Oracle got involved, you needed to use MySQL client to connect to MySQL server, and any software that links to MySQL Client must be GPL (or you must purchase a commercial MySQL client library). The value proposition for Oracle/Sun in MySQL is that most companies don't want to GPL their internal Commercial-in-Confidence apps so they'll buy commercial MySQL client licenses to keep those apps non-GPL.
For F&OSS to excel in the future there does NEED to be a funding model for it that works, and key to that is getting the message across that the 'F' is for Freedom not Price. It is my impression today that more people are interested in zero-dollar downloads than they are in F&OSS. After investing over a $1M in developing F&OSS I've found that many many people who rely on my software will sooner spend $$$ on proprietary software rather than help fund the development of F&OSS (which they self-righteously think should cost zero-dollars).
I think that the key message that needs to be communicated about F&OSS is the intrinsic benefits: customisability, security, flexibility of F&OSS - not price. Anyone funding F&OSS is not the Devil - those who use it and don't help fund it look more Devilish to me.