Sorry, just felt I had to chime in here.
With all due respect to Toast or whomever, "upnote" is too staid and boring. Not edgy or catchy enough. It makes one think of office supplies, or greeting cards, or word processing software, something like that. C'mon, guys... we need to swing for the fences and get a name that is truly worthy of a huge market opportunity. Ideally, the name would be able to hold its own alongside the likes of "twitter", "myspace", "facebook"...