This is a link to a copy of the (somewhat redacted) *.pdf document of the FISA memo that some people have been getting excited about. Just in case they are right that it will be removed from the internet very soon, a copy is at the link. Whispering Bluegrass suspects that since it's been released, in redacted form, it will not actually be removed from the internet, but there's no harm in having another copy.
For information that the public needs to know, that would endanger the life of informants if they published under their own name.