Have a look at these fasteners:
http://www.pemnet.com/fastening_prod..._to_sheet.html
If there is some way of inserting these without a hammer and anvil then I am totally sold (Does anyone know of such a way?)
EDIT: After some further reading I have discovered more problems, they appear to be almost impossible to remove and cannot be inserted from just one side (you need access to both). Still, they are pretty cool