This is very interesting to me because not only is it in the realm of eFinance but it also reminds me of a very exciting time...remember back in the day when you could PayPal someone money using the IR Port on your Original PalmPilot? I used to split checks and do all sorts of things.
Now, a start up called TextPayMe has a very nice implementation of "Pay Over SMS". You just text "PAY amount number" to their 5 digit number and you're set. Chris Brooks, my boss, and I have already used to to send money around. Additionally, you get $5 for signing up, and if I (or you) sign up only 35 folks (it's FREE) I'll get an Xbox 360 (for the guest room.) Sure, it's multi-level marketing, but it's worth taking a look at if only to see their two-factor authentication.
You have both a password and four-digit pin. When you pay someone via SMS, you'll get a phone call back confirming that you were serious, then you type in your pin. You have to know something - your pin - and have something - your phone. Very cool.
I wonder how long until PayPal buys them. Anyway, sign up, get your own profile and spread the word. No banking or account information is needed unless you want deposit money.
UPDATE: More on TextPayMe at PaymentsNews, with some specifically interesting tidbits. Everyone but Verizon can use their 70820 number. They will market towards uses by CraigsList users. Anyone who signs up during the beta will NEVER pay a transaction fee. (Wish I'd gotten in on that when PayPal started!) Also, they have support for paying some online merchants.