I am familiar with having one coloumn expanding in a layout as the content changes, however, I have come accross 2 problems: one is having a second column expand without writing over the footer of a page, and the other is maintaining the exnded column when, as occurs on my site, information is transported between pages. Please post with contact details if you woudl like to take up as a project.
Hmmmm, not completely
Hmmmm, not completely following you. But take a look at Tutorial 8 here (Liquid two column layout):
If that doesn't help post with some more details and explain particularly what you mean by
information is transported between pages