I saw this and didn't realise the consequences of my actions; now as a result, I feel I must carry on with the burden that this "super-ultra-mega dare" has in the natural law contract of life, the Universe and everything. Plus, it'll make a semi-interesting post.
The concept is simple. Somebody writes 25 things about themselves, and tags or emails it to 25 other people. They then have to perform the same duty, thus spreading it around the Inter-webs faster than a speeding bullet. So, as my colleague Tom Foremski has done, consider yourself well and truly tagged.