If you're looking for a fun christmas lights set to music, you should check out this video on Google Video.
If you are looking for something that will excite the geek in you, you should should check out this article on Free Online Date Storage.
The most exciting of these I think is Openomy. Openomy is a tag based online file stystem, with an open API. The possibilies of this system are numberous. If you have no idea what I just said, all you need to know is that you can store up to 1Gb of stuff online for free. So you can back stuff up if you like. :) Geeks can read more about it, on this wiz kid's blog.
Earn a free iPod Shuffle. I only need one more referral, and it could be you!