Fun Fact:

If you tack '.patch' onto the end of a Pull Request you get a 'git am' compatible patch file complete with the email address that Linus complains is missing ;)

https://github.com/torvalds/linux/pull/17.patch

EDIT: I should note this works on any commit as well. Take this commit from Casbah (the Scala MongoDB driver I work on) - https://github.com/mongodb/casbah/commit/990a36fbde69db26689... - removing .patch gives you the normal web based github commit page.