In the meantime, I'll just note that Tim is talking about Atoms, a field which I have taken an interest in for some time.
I've dug up an old presentation from 2003, which I gave a slightly modified version of at Euro Foo in 2004.
It's a bit basic, well it's a bit pants .... but it serves as a very general introduction into the field. So I'll post the slides here.
[Corection - had some problems with slideshare - so I'll just provide a link to download the file or you can go to slideshare directly.]
I should really post up the EurOscon version as a video ... but since I'm going to be combining this with the FOWA stuff - including the different metholodogies needed for CA / CODB, the stack is bigger than just SaaS / FaaS / HaaS and the problem with patents & ROI - all into one monstrous web 2.0 expo talk, I thought I'd wait.