Visualize this: A woman is pushing a loaded grocery cart through the frozen-food aisle when she gets a mobile phone alert. Her checking account balance has dropped to $100. Uh-oh, the food will be well over that amount.

But wait. Up pops a clickable ad, offering her the chance to sign up - right now - for overdraft protection.

That might be a marketing no-brainer, but it's still wishful thinking in mobile banking. "Banks are starting to ask for this capability," said Drew Sievers, co-founder and CEO of mFoundry, a Larkspur, Calif., technology firm that creates software for mobile banking and mobile payments. "But security risks are a big concern."

Sievers says current mobile marketing strategies have great potential for helping banks gain a greater share of customers' wallets. For one thing, financial services firms can partner with other businesses that want access to their customers, as Visa has done with Starbucks. A mobile gift card application that mFoundry created for Starbucks features a Visa advertisement. Those who use their mobile devices to reload Starbucks cards get an extra $5 added, if they pay with a Visa card.

Mark Schwanhausser, a senior analyst with Javelin Strategy & Research in Pleasanton, Calif., likes this type of partnership strategy. "Banks have incredible insights into how individual consumers spend their money," he says, "and they sit in a spot where they can play an instrumental role in directing coupons, offers, rewards and other savings to consumers."

Sievers says banks also should be looking to drive traffic to their own products and services by connecting with mobile users. Someone seeking real estate information on Zillow.com is a prime candidate for a bank's mobile mortgage ad, for example. "The banking industry has only barely begun to tap into this potential," he says.

Banks' mobile opportunities are different from those of other industries. A bank is unlikely to add new customers via a mobile ad, but it can grow revenue from existing customers, and this is what Schwanhausser predicts will blossom this year.

After all, connecting advertising to the deep demographic and financial information banks already have on customers is powerful marketing, he says.

Couple of issues here with respects to privacy and security... please Mr. Banker don't share my name with any of your 'partners.'

However as I have been telling some of my clients for a while now... the entire mobile banking landscape will succeed only through partnerships. Banks partnering with other service providers... (but to what extreme? And at what cost to the customer?).

A very important partnership is the one between those that provide services to the banks... Enterprise software providers, mobile app developers, system integrators - the best way to break in and go deep in mobile with a bank will be based on your partnerships with others. This is especially true for startups in the mobile space - go out and seek partnerships with providers who already have entrenched relationships with the big banks.