Living without a car...?

I live in downtown Milwaukee and am considering ditching my car. Just wondering what thoughts people had on living a car free life.. Are there any suggestions, tips, or things I should consider before I ditch it? I haven't used my car in weeks and only use it when I go to visit family in the south burbs about a 20 minute car ride away. And for a background on Milwaukee's alternative transit options.. there is only a bus system and cabs.>