Tagging everything (on your PC)

It's a common people problem: files a thousand in your PC or external memory classified in folders under folders. Searching an old document becomes a nightmare. Indeed, Google Desktop is a solution but it doesn't fit for images or image-PDFs.
Folksonomy has brought us the tagging system and some applications like Delicious have gained a time share in your daily digital experience. But this is not enough, we need a system to tag our files and find more easily what we are looking for, particularly if we are the only ones to blame.
tag2find address this shared need and can be extremely useful for a bunch of purposes (collections, scientific research, digital libraries...). In healthcare, you can tag your medical images, clinical cases and your scientific output. If you find out additional needs, feel free to comment.