Yesterday I came across a few papers on SCRUM and XP:
Scrum in five minutesA very good intro to Scrum. Perfect for people who want's to get the gist of it.http://www.softhouse.se/Uploades/Scrum_eng_webb.pdf
Scrum and XP from the trenchesA really good paper by Henrik Kniberg (Crisp) on their experiences working with Scrum.http://www.crisp.se/henrik.kniberg/ScrumAndXpFromTheTrenches.pdf