In the last couple of months, I found some excellent posts about banks inSecond Life.
* Futuristic Friday: Banks in Second Life
* Is your money safer under your virtual matress?
* Several posts on banks such as Saxo, BNP Paribas and ABN Amro (in French)
The following real-world banks have set up shop in Second Life: ABN Amro, BCV, BNP Paribas, ING Bank, Saxo Bank, Wells Fargo.