I was going to blog about Google Knol but I got a bit creeped out after reading a bit more about it - more on that some other day. Far more interesting though, yesterday Amazon added another huge web service to their AWS offering - this time an Erlang based SimpleDB (limited beta) sporting both RESTful(Update: yikes they tunnel through GET - that stinks!) HTTP/RPC and SOAP interfaces - see the Developer Guide and other good related posts (love the title of that last one).
Amazon now provide pretty much have all the infrastructure that a web application might need - hosting, storage, database, message queuing. This stuff is utility SaaS in its rawest form. Nick Carr has a timely piece about what Google are up to in this space. (Update: Joe Gregorio, now of Google, has an interesting megadata view).
