There are two paths that a vendor can take to create a development platform for cloud computing: cloud-first or tool-first.
- Cloud-first approach to PaaS: first build a cloud platform, then build a development tool that runs on top of it. This is the approach pioneered by Force.com and followed by Coghead and Bungee Labs.
- Tool-first approach to PaaS: first build a development platform that is host-able tool (e.g., studio runs in a browser), then "push" that platform into the cloud. This is the approach taken by WaveMaker.
For most software vendors, however, the cloud-first development process has distinct disadvantages. First of all, it puts you in the data center operations business, which requires a very different DNA than software development. Next, it makes development itself difficult, because the cloud adds a level of indirection and complexity to all development tasks. Finally, you will be forced to do cloud port eventually to get to a SaaS cloud people want to deploy on, like Amazon EC2 or Google App Engine (assuming they ever exit the Python ghetto).
A tool-first approach to PaaS development is much more straightforward. You start by creating a host-able development studio (pretty much rules out Eclipse plugins) and do your build and test on standard hardware. After you have build a solid product, you add multi-tenancy to the studio and customize deployment for your cloud of choice (or use a partner like Elastra to do the deployment and administration for you).
A final oddity of the cloud-first vendors is that they have all delivered proprietary development platforms. This provides a "roach motel" level of lock-in - your logic and data can checkin, but just try moving them to another RIA or Ajax platform! Again, SalesForce can throw its 500-pound gorilla weight around and make the Apex language successful. It is hard to imagine, however, that 5 years from now people who have learned the Coghead language will be in more demand than, say, Java developers.