Glenn Letham poses some excellent questions in this article:

What do Rachel Rosmarin and myself have in common? Well, she writes for industry-leading Forbes Magazine and I write/manage GISuser… big deal eh? [just kiddin around!]

Ok.. but really, something we do have in common is that we were both in attendance at Where 2.0 recently and looks like we both still have a big ? on where the money will be found in the mashup space. There’s no doubt that there’s money to be had, however, companies still haven’t ironed out their business models and the most common model being sought after in the mashup space to date is advertising revenues.