Insulate your basement with foam board. NEVER use fiberglass. Includes information on insulating floors, too.
Learn How To Insulate Basement Walls Properly. Basement Insulation is very difficult to under. Learn how to insulate basement walls from industry pro Todd Fratzel.
Oh boy do I have to do this!!!!!!!!Expert Energy Saving Tips: The Family Handyman
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Don't forget this step when you insulate or finish your basement
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Closed-cell rigid foam insulation panels. I found these mentioned in Fine Homebuilding, and they definitely look worth exploring. Replace framing and fiberglass insulation. Install faster.
Finishing the basement …
Finishing a Basement: Walls, Ceiling & Flooring (includes idea on insulation)
How to insulate basement walls