Xeround is a SQL Database as a Service vendor which is aggressively targeting the PaaS vendors as a channel. It has established relationships with Heroku, Engine Yard, AppFog and AppHarbour so that if you subscribe to their PaaS you are offered an upgrade to their bundled MySQL database services through a service from Xeround.
In addition to PaaS there is a class of vendors who provide external services to PaaS through “marketplaces” that the vendor sets up. We refer to these generically as Application Services as a Service (ASaaS). The stakes are potentially huge – the PaaS takes over from the Operating System as the dominant factor in the purchasing decision for server-side technology. We’re not saying it definitely will happen, but it might.
AppFog (the company formerly known as PhpFog) has become the latest enthusiastic adopter of CloudFoundry to go to General Availability with a value-added implementation of the open source CloudFoundry.org stack. The key differentiator is the RAM-based pricing policy around the Public Cloud offering – roughly $25 per GByte per month (first 2Gbytes are Free).