Kippt (YC S12), An “Evernote For The Web”, Lures Devs With New API, App Gallery
techcrunch.com
techcrunch.com
Why did you use an inbox for the user's data? I reason it is not the right definition. People hate the inbox. It actually turns them off from using products/services. I've tested it and mentioning the word inbox makes conversions plummet.
I would call it collections, queue, stack, or something else. Even panel.
I do like the process to join in, but I would test the flow through which people create accounts. I'd have them start saving stuff first, then requiring a password to save the data.
Anyhow, good luck
edit: obviously happens with anything that lands on old.kippt.com :)