Ahem:

"Slashdot does not mirror the sites it links to on its own servers, nor does it endorse a third party solution. Mirroring of content may constitute a breach of copyright and, in many cases, cause ad revenue to be lost for the targeted site. The questionable legality of the practice is one of the primary reasons that Slashdot has not implemented mirroring."

http://en.wikipedia.org/wiki/Slashdotted