On the other hand if you are looking to build a product web site or a company web site then Drupal will win hands down. there are innumerable modules in Drupal which will help you to bring in an array of features to your web site with ease.

There are also many other content management systems like Joomla, Plone etc. We have to choose the right one which will make our task easier and at the same time will give out good results.

Mozilla Labs has launched Bespin, a platform for application development targeted to open web standards. Bespin is still a pilot project, but may in the future many of us may use this or another similar model for developing collaborative web applications.

Bespin says it is still an idea, since most of the features are part of even a simple list of “to do” (things to do). The idea is to provide an online platform for developers in the development of websites and web applications. Thus, we could say that Bespin is a code editor web-based, designed to increase the productivity of developers and teamwork based on open standards.

It is a programmers editor that runs inside a browser, whose main objectives are:

- Ease of Use
- Real time collaboration
- Integration of command line
- Extensible
- Able to work with large files
- Accessible from anywhere, and device

We will have to be alert to this new product, to see what we can, especially when the advantages of working in groups, from anywhere.

For new here is a good handbook for beginners in this technology.
http://www.programatium.com/ajax.htm

Ajax is usually the union of several technologies, ESPCI layer is written in javascript that works between the server and the user operates asynchronously (independently of the communication with the server). Many of the recent success of Web applications, including GMAIL and Google Maps are part of Ajax.

In this link there are some diagrams and information that clarifies a bit.
http://www.uberbin.net/archivos/internet/ajax-un-nuevo-acercamiento-a-aplicaciones-web.php