Some 20 letters written by Anne will be on display at the Amsterdam Historical Museum: 12 April until 3 Sept 2006. This is the first public display of her letters. The first letter in the exhibit was written to her grandmother, when Anne was seven years old. The final letter was to her father while they were in hiding, when she was about to turn 15.
    Like any fine exhibit, there will also be photos, building models (?), and information explaining the historic context of her life and letters. The exhibit includes the two versions of the diary Anne wrote (the personal ones and the for-publication one) which visitors can digitally browse and compare. I assume this is just text, not scans. You can compare the texts in the book, The Diary of Anne Frank: the Critical Edition (link is to amazon).
The link is in Dutch but there is an English translation near the upper left corner of the page.