There are some great agile resources out there and some not so great ones. Here are the ones I like and recommend:

And here is some free stuff:

Scrum Master Position Description – I got sick of clients asking me if I had one of these so I wrote one and open sourced it. Help yourself.

Product Owner Position Description – as above

If there is something else you think should be here then please comment and I will see I can sort something out.