In order to maintaining your privacy you want to be sure that the deleted file will be deleted permanently. Here comes the importance of file shredding software. There are several such tools and many of them are mentioned in my previous posts.
Here is a very simple, very easy to use (drag and drop), yet powerful file shredding program that destroys the data you choose before the deletion, using a complicated procedure of filling the actual content with random data.
Freeraser can function on three levels: A fast destruction (standard 1-round filling of random data), A forced destruction (3 rounds of filling according to DoD 5220.22M standard), and An ultimate destruction (35 rounds of filling with data according to Guttman algorithm).
You can download Freeraser from Codyssey (works with Windows XP and Vista)