Tips: ~Top 31 Things You Can Freeze To Save Time and Money ~ ("ever wonder why plastic milk jugs have those circle indents on the side? They are there to allow milk to expand while freezing! I had no idea!") ~ Great site with the best freezer tips
Not all of these are healthy substitutes in my opinion, but some are, so use your own judgement. 20 Unique Healthy Food Alternatives --I'm interested to read about some of these things, and I know some of the substitutions only work in some circumstances.