I'm sure most of you have heard about this through Neil's blog or some other source, but in case you haven't, here goes.
A few days ago, Terry Pratchett donated half a million pounds(about $1 million) to Alzheimer's research. Fans have set up a website,
Match It For Pratchett, with, as one would assume, the goal of matching Terry's donation. The site is selling t-shirts, and has a virtual donation jar, along with links telling you how to donate directly to both UK and US Alzheimer's charities.
Also, if you have much more money than myself, and are a fan of Discworld,
you can bid on a replica of "The Luggage", and all the money raised will go to the Alzheimer's Research Trust.
And
here's a link to the Sun article Terry wrote about his disease, which is very lovely, and still has all of his wit, despite the very serious subject matter.