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I think for military drives, they also require 7-pass wipes too for the lowest security classification. At least, that's where the 7-pass standard comes from.

There are some utilities that do a 7-pass (or more) random rewrite of any deleted file space when you delete the file. Convenient for removing the info from the disk on a steady basis and not just waiting to do a multipass erase when you sell/dispose of it.

There is also encrypted virtual drives that reside in a single file on your partition. These utilities give you another drive letter but it is heavily encrpyted storage that is accessed with a strong password system. So no one gets at that data casually. You can park your web cache and sensitive documents (porno, restricting hacking, illicit passwords, etc) in such a virtual drive pretty securely.

And for the Linux folk, they can run entire filesystems that are fully encrypted start to finish. I think the BSD family is probably the best at this.