Well, Bear Stearns comes to mind here as the likely culprit.
I think the entire financial sector is going to look a lot different in a few years after this shakes out. It will be interesting to see if Citicorp survives.
I can't imagine Fidelity letting FDRXX go under for instance, as that would decimate their business, as it would lead to a mass exodus from Fidelity Funds as folks panic.