StumbleUpon launched a sweepstakes this week, in which it is giving away prizes to users simply for stumbling. It started on Tuesday, but it is going on through Wednesday and Thursday.

They’re giving away prizes like a $100 Amex Gift Card and a NOOK HD – 8GB.

Each day, they’re putting out a List Of The Day with what they consider to be some of the best stumbles of the year. The lists can be found on the sweepstakes page. You can just stumble through the list, and winners will stumble upon the prize somewhere in the mix.

The lists are published at midnight.

“The odds of winning a prize depend on the total number of users who participate in the Sweepstakes each day of the Sweepstakes,” the company says. “No cash or other substitution of prizes is permitted, except at the sole option of StumbleUpon for a prize of equal or greater value. StumbleUpon will not replace any lost or stolen prizes. Winners are solely responsible for any and all federal, state, provincial and local taxes, if any, that apply to prizes.”

Winners will be notified by email within seven days.