Bank of Skyrim? is my next Foundation Mod. Not only can we put our money into the bank, but if we do so, this means the local economy will benefit. We can also take out loans with interest rates, which is going to be interesting, and exchange our gold for lightweight paper, although I might not worry about this.
I like the loan thing though. Claire really wants the Whiterun house, but she's terrible at saving money. She's got like 2000 gold. She might get a loan, so she can get her own house TO-DAY.