Emma has donated various Harry Potter items to a charity on ebay called Wild Trout Trust. 100% of the proceeds go to the foundation which  works for the conservation of wild trout in the UK and Ireland through the protection and restoration of habitat.

Some of the items:
Emma, Dan, Rupert signed train set
Bag given to cast and crew
Autograph
There is also; a time turner, a shirt, a harry/hedwig figure, and a set of collectibles.

Thanks for the tip HPANA!