Here's another sign of the fantastic growth of the mobile web. Even the big commercial banks are getting into the act. Bank of America, the largest US bank has launched a mobile site. Some small banks in this country have mobile sites but this is the first one I've seen from one of the big nationwide banks. Citibank's mobile banking is a Java ME app, not a mobile web site. For mass adoption these things should be on the web as relatively few users will download and install a application on their phones.
The Bank of America mobile site lets users check their balances, pay bills, transfer funds between accounts and find bank and ATM locations. The service is free of charge - other than what you provider charges for data access. As expected for a banking site, security is tight and you must use an "approved browser" to do anything other than search for ATMs and branches. I couldn't find a list of approved browsers on the bank's site but the Openwave V7 browser built into my Boost Mobile Motorola i855 seems to work while with Opera Mini I get "For security reasons, your device can't access Mobile Banking." Interestingly Barclays, a big UK bank also just launched a mobile site and Barclay's recommends using Opera Mini or Opera Mobile!
The Bank of America's mobile banking site is at https://www.bankofamerica.com/mobile/.
I don't have accounts with either bank so I can't really review these sites. If you're a Bank of America or Barclay's customer and have tried their mobile banking, leave a comment and let us know how useful you find it.