I'm working on something like this at the moment, which will be released within the next few months. I can email you when it's ready if you're interested?
Sure, but to be completely honest, this is one of those things where I'm very unlikely to take a big chance on a new, untried software. At least, not for my business. For my personal use, sure.
I'd like to see a helluva lot of proof that you're a legit company before trusting you with this kind of information.
I say this not to discourage you, but just to explain how a business owner will think about your premise. Or at least me, don't know if this is representative of your actual audience or not.
In any case let me know when it's up, I'd love to take a look!
Of course, and these are problems I will be working to solve very early on. The kind of users I'm aiming for should be rightly concerned about the security of their passwords and I will be providing as many mechanisms as possible, both socially and technologically, to prove said security in a transparent way.
Bonus points for something which makes having a central repo of shared passwords possible, Keepass is terrible for this.