Here's a hint: who was using the slogan "The Network is the Computer" 10 years ago? And who was the first company to deliver a RIA technology?
So why have they been MIA in the PaaS goldrush?
Let's think about this another way. What database are people most likely to run on their slice -o'Linux-in-the-cloud? mySQL perhaps? Which was just bought by...?
The Register has an article about a possible JavaOne announcement about how this situation might change (with a leaked slide presentation! Fell off the back of an ftp packet, I guess..)
(The weird thing is is that the presentation talks only about PostgreSQL. An old file? Or a different corporate camp? Didn't get the memo maybe?)