Official CBS site has all the monologues from August 2005 to right now available. If you, like me, don't want easy ways and have way too much time on your hands - go and find them, they're all there:
http://www.cbs.com/latenigh...
If you're more of a "common sense" type of person, click on the website, listed below.
If you're just generally lazy - sit back and enjoy, i'll be posting some that i liked here.