Start.com has always been an innovative service but today's announcements have kicked it up a notch. In his post Start.com: A Preview of Web 3.0, Scott Isaacs writes

Today's preview of the Start.com Developer illustrates fundamental shifts in web programming patterns:

• DHTML-based Gadgets
  Start.com consumes DHTML-based components called Gadgets. These Gadgets can be created by any developer, hosted on any site, and consumed into the Start.com experience. The model is completely distributed. You can develop components derived from other components on the web.
• Adding Behavior to RSS
  RSS (Really Simple Syndication) is an incredible platform for sharing content and information. Today all RSS feeds are treated equally by aggregators. Start.com integrates the world of RSS with Gadgets enabling any feed to optionally be associated with a rich, interactive experience. Some feeds present information that may be better presented in an alternative format. Other feeds leverage extensions or provide extra semantics beyond standard RSS (e.g., Open Search, Geo-based coordinates, etc). By enabling a feed to define a unique experience or consume an existing one, the richness of the aggregator experience can improve organically without requiring a new application. Of course, we also allow the user to control whether a custom experience is displayed for a feed.
• Open-ended Application Model
  Start.com is what I call an open-ended application. An open-ended application consumes Gadgets and provides core application services and experiences. This is and has been the Start.com model since its inception (how do you think they released new features every week?). By opening up Start.com, we have removed the boundaries around Start.com features and experiences. The community of developers and publishers can now define and control the richness of the Start.com experience.

These are the web-applications of the future - applications that can integrate not only content (e.g., RSS) but associated behaviors and services. Today, via Start.com, the developer community can preview MSN's client technology and infrastructure. At Start.com/Developer, you will find early samples and documentation. This site will be continually improved with more documentation and samples. Go and build Gadgets and custom experiences for your feeds. Most importantly, since we are far from finished, please give us feedback. The platform can only improve with your feedback. Also, we are always looking for interesting Gadgets and custom RSS experiences.

I'm not sure I'm feelin' the "Web 3.0" monicker but the extensibility of the site is definitely cool beans. I remember a conversation I had with Steve Rider I had during the early days of the site where I asked if it would be possible to customize how different RSS feeds were displayed. At the time, I had noticed that there were three primary widget types for weather reports, stock quotes and headlines. I suggested that it would be cool if people could add annotations to the RSS feed to tell it how to display on the Start.com. Being an XML geek I was was thinking of extensions such as a start:display-style element which could have values like "columns", "headlines" or "rows".

Steve thought my idea was cool and chatted with Scott Isaacs about it. Since Scott is the DHTML guru of DHTML gurus, he kicked the idea up a notch and actually designed an infrastructure where sophisticated rendering behavior could be associated with an RSS feed using JavaScript. The rest is history.

Damn, I love working here.