My sewing room is in my basement. I am also in Wis. No water issues, but to be on the safeside we went to Home depot (we were refinishing the basement anyway) and got 2 rolls of this rubber nub stuff (hard plastic nubs, comes in big rolls about 3' wide, apparently this is also used for outside basement walls for drainage, so it was int he aisle with gutters, drainage tubes, etc...). Each roll was about $60, took 2 rolls to do the entire basement, then we laid laminate flooring over it (if you use laminate you don't have to put a subfloor oevr it). It made a HUGE difference in keeping the basement warm and dry, no longer feels like a basement.
And I have a dehumidifier that I run in spring/summer.
Another note - can lights (recessed lighting) give off heat and warm the basement. We replaced our flourescent lights with can lights and this also helped keep the basement warm.