"I just ran across someone stating on another forum that they just store their nuts and granola in ziploc bags, making sure all air was pressed out of them, for weeks or months on end,"
Yeah, that's going to oust most of the oxygen and / or moisture that can ruin this type of stuff.
BTW, the reynold's handi-vac is a pretty inexpensive upgrade from this technique... really sucks all the air out and is just as reliable as any zipper bag you're going to find.
I believe Sarah, of freezerbagcooking.com, reviewed one of these on her blog.
Yup... I remembered right... Reynolds Handi Vac Review er... check that... the link expired with one of Sarah's updates... I can email it to you if you'd like... just PM me with your email address...