The charity bit for the run supports the Royal Children's Hospital - yep, its for sick kids (not "fully sick" like Trevor or Paige, we mean "really ill").
You can sponsor JdR by going to: http://www.imworkingwonders.com.au/personalPage.aspx?SID=95751
To spice things up, for every $20 donated, JdR will carry a frisbee on the run. So if say he gets $200, he'll be carrying 10 frisbees (1.175kg of plastic), jovially waving them around to the other runners and such, (depending on his fatigue levels of course). [Edit - yes, you can just donate $5 - the $20 bit is the added up thing]
Yep, make a donation and you get to help kids, encourage JdR doing something silly, and promote flying disc sports, all in one go! Now, there's VALUE FOR MONEY.