Well, like the title suggests, here is some cool stuff.
Then there is, well, something else, when I've thought of it that is. But LaTeX is really cool - I've been doing some of my uni assignments with it lately.
Some more cool stuff is Apple's iPod. I purchased a 4G 40GB iPod early February, and I'm loving it. It seems to hate usb though, so I've also purchased a firewire card, which made my iPod much happier. I also have the artic iSkin, which is the perfect accessory for your iPod.