Caveats - it's experimental. It's read-only - you can't change notes yet, this represents an afternoon of work, not a real project. I don't really care about the ability to edit notes, 80% of my use case is just reading things I've written on the desktop.
Most importantly, because of HTML and cross-domain stuff being what it is, all requests made my this app go to MY server, and I proxy them to the simplenote server. This means that (a) I might be logging your password (I'm not, but you can't prove that), and (b) it all goes over HTTP because I don't have an HTTPS certificate, so someone else can sniff your password.
DO NOT USE IT IF YOU CARE ABOUT THIS.
You can mail me at email@example.com if you have questions / hints / patches.