Hate to carry money in my pockets, and never carry a wallet on my person. I keep a money pouch containing $100 or so and change in my car at all times along with my wallet (also kept in the car). That way, if I'm out somewhere I always have cash if I need it but don't have to have it on me. For some reason, I just don't like having things in my pants pockets, especially coins.
I always carry my credit card in my shirt pocket along with my work security badge, so I am always covered even when I forget to take money from the car when I stop at the store or restaurant. I try to put most purchases on the card so I get 1-3% back. The card is also my Costco card and I make most of my purchases there anyway. I would like to pay my utility bills etc. with the card to get credit back, but haven't looked into how this is done yet.
All this talk of money is making me want to go and buy a new imac now that Leopard is coming out.