The best time to get your customer's attention is right after they log in to look at their account. That's why login-screen marketing should be in your mix (see previous coverage). But, your message is not necessarily welcome at that point, so it's a marketing option best used judiciously.
Wells Fargo makes good use of the technique this month with an open letter from CEO John Stumpf. It's been a while since I logged in to my Wells Fargo account, so I'm not sure it was posted. But it carries an October date, so it was probably later in the month after Wells Fargo prevailed in its bid to buy Wachovia.
Many financial institutions have posted we-are-still-going-strong messages during the past few months. The Wells Fargo message isn't particularly noteworthy, other than they don't beat around the bush asking, then answering, the question:
What does (the Wachovia acquisition) mean to me as a Wells Fargo customer?
Wells Fargo splash screen displayed immediately after logging in (10 Nov 2008)