Amazon Web Services is launching a new feature every couple of months. They have recently introduced server features (SSD, provisioned EBS) that are very attractive if you host your own database. They provided hosted Mysql and Dynamo databases.
Heroku is very strongly promoting Postgres with some interesting features (text search)
Nowadays it seems that you can get a lot done without an IT team and without breaking the bank.
Do you have a database powered backend? Come share your experiences with various hosting providers.
As always BYOI - bring your own ideas :)