If you want to one up it, give away what hasn't been given away before...
Vacation home in Thailand or Cabo or something... maybe "vacation for life" share of a timeshare condo somewhere decent...
You could do trip around the world, charter a private jet for the winner and X of his or her friends to go anywhere for X number of days, example.
Webmaster shows on us: Passes, travel, and hotel for all the top webmaster events for a year.
"U-haul trailer full of cash"...
Reverse hookers: Send over a series of hookers that pay the winner to have sex with them.
There are so many interesting options.