Here are some links to notes on different intrastructure projects (projects that aim to create tools users can employ to customize their information spaces)
Bibliographic Data Management Software for Every Student:Embedding a Researcher's Tool in the CMS
Lorcan Dempsey's weblog: Stitching services into user environments - intrastructure
"....The Google Scholar discussions have underlined the emerging importance of the desktop (or, rather, the browser) as a venue of integration. The discussion of toolbars, FireFox extensions, bookmarklets and RSS feeds highlights the growing availability of desktop tools for interaction and integration. We could call these 'intrastructure'<*>. They tie together data and applications in flexible and simple ways. They operate 'close to the surface' of the web information space, typically use web protocols and want to 'keep it simple'. Intrastructure is in the interstices of larger infrastructural pieces, feeling its way like a vine into places it can flourish."
Gigablast Custom Topic Search
"...Now you can create your own topic specific search engine in minutes. Gigablast's revolutionary, new technology allows you to create a list of up to 200 web sites (or subsites) and a search box that searches just those sites. Even get back the search results in XML so you can customize their apperance. Give your visitors a unique search experience, completely free of charge. For instance, if you have a site about horses, why not create a horse-specific search engine? Gigablast is committed to bringing you new and useful internet tools..."
Powerpoint on component based development of instrastructure
Tres technical, however, what I got out of it was that there are promising developments in creation of standards and platforms for developing instrastrucure.
-from LorcanDempsey weblog