The most obvious revenue model for Web 2.0 businesses (that publish web services) is based on subscription economics. This works well for coarse grained services like Flickr, MyBlogLog, Typepad and many others. But what about fine grained services such as those offered by Xmethods and StrikeIron whose platforms are approximating to the anatomy of a web services broker described in this diagram? This high level description is predicated on the rise of intermediaries (or cybermediaries) whose econmomic model is based on ground breaking research from Sarkar, Butler & Steinfield. Systinet has been providing the directory technology to corporates for internal use for some time now.
Perhaps one approach could be to offer independent developers (and service providers) a means of deriving an income based on the number of times a service is invoked, say 10 cents per invocation. So a post code provider like QAS makes its post code look up function available with a UI (for web sites) and without a UI (a call from another application). The problem is there isn't a widely adopted micropayment infrastructure that doesn't rely upon the excessive and rapacious settlement costs being levied by the incumbent financial "community". Ian Grigg and many others have written pretty definitive theses on how microcash systems could work on an internet scale.
When one of these emerges, then it is not beyond the realms of possibility that thousands of talented programmers out there could make a fractional living from millions of invocations of their innovative fine grained routines, in the spirit of Winning by Sharing a concept for those who belong to upstarts, the talent that is being forced out of large companies and the risk-takers among the big companies, who are willing to bet more heavily on the future than they do on the past. It is for those organisations who understand that the Internet has caused a fundamental, tectonic shift in people's attitude towards work and the realisation that a ‘career’ has ceased to be a feasible way to organise working life.