On my clients site (www thenutritionmom dot com) my sidebar is continually aligned to the bottom of the page

Although I can remedy this using a negative integer; it differs on each page due to a varying amount of text.

On pages such as "About & Contact", the dropdowns don't seem to "stay" in place. Ack!

I feel that this set of edits is very simple, but is driving me crazy! Any help or guidance is most welcome.