incrediBILL - 7:30 pm on Apr 24, 2011 (gmt 0)
Hopefully one or the other? Googlebot will not see the noindex, nofollow if those documents are Disallowed via robots.txt. You have to use one or the other, not both.
Both is double protection, a technique I highly recommend.
I do both robots.txt and NOINDEX as a fail-safe which recently saved my bacon when I made a small mistake updating robots.txt. Thousands of pages would've been indexed in days and it takes forever to get rid of the mess. However, the redundant NOINDEX stopped Googlebot from making a big mess in the first place.