But there are two sites that I think truly deserve it. Sadly, both are still in development, but if all goes through as planned they will be awesome.
The first is
Photosynth by Microsoft. Basically flickr, but displaying images in pseudo 3D. If it works as planned it could be awesome. Try the tech demo out.
The second is up and running, but needs quite a few improvements.
Yahoo Pipes basically lets you wire together a bunch of feeds and modify exactly how they interact with each other. An interesting idea with some very interesting results. People have come out with a lot of cool stuff, but I can think of some really useful things coming out in the future out of this. I strongly recommend you check it out.