I could go to my del.icio.us page, but that's limited only to what I've been scanning & bookmarking. What I like about it is that I can throw in a likely tag and be given a range of sites that are foggy in my memory, so I can narrow the search.
But now it looks like there's a site out there that can do that, but on a much larger scale. With over 5,000 Web applications in their database, the folks at Simple Spark provide a place to share and search for cool stuff online. And to prove that they're providing a useful service, they've given us this handy video:
Via Karl Long.