I used to work at a company called Octopus.com, which created a nifty technology to be able to "scrape" content from different sources (e.g. web pages), and compile them all together in one page "view". These views were then categorized, shared, and rated.
Well, unfortunately, Octopus went the way of the dodo with the dot-com bust. All assets were sold to Ask Jeeves and put to use on B2B and internal projects I assume.
Now it's 2006, and the latest buzzwords are "Web 2.0" and "Ajax". And lo and behold, what do we see popping up? Yes, sites that do almost exactly what Octopus did way back in 1999. Of course, these sites no longer need to depend on Java applets or IE specific code. They use Ajax technology, which, for all intents and purposes, is built in to all current browser versions.
Check out NetVibes and ProtoPage as two examples that remind me quite a bit of my brush with the dot-com hey day.
EDIT: Co-founder Christoph Janz reminded me about his Web 2.0 Ajax driven service named Pageflakes. He runs a very interesting blog on Web 2.0. Check it out at http://christophjanz.blogspot.com/