Do you know about http://www.reddit.com/r/history? There are subreddits for many different interests. I've found them to be of similar quality to HN. Great communities of people communicating around a shared interest. :)
If I understand correctly, the browser stores a certificate that proves you own your email address. These certificates are only valid for a certain amount of time, even if you check that you own this computer. So what happens when your cert expires? Do you have to go back to your email and re-click the link that gives you a new cert to be stored in your browser?
Also, if I'm using a public computer, is there a way for me to manually revoke a cert when I'm done using the machine? It seems that even a 1hr expiry is too long for this case.
The images that are being sent contain the amounts, tax, subtotal, tip and total for up to 16 individual people. Here's an example: http://billr.me/J7W5uY
In my field studies, I found it was not very reliable. Text recognition would often fail even on printed receipts. Also, several of the restaurants I went to used hand-written receipts. So I ultimately decided against OCR. If it had worked well, I do think it would be a nice feature for the app.
Thanks for the feedback! I'm working on other problems as well, but this was a real pain point for me last semester. I'm a senior in college and eat out in groups quite frequently. It's always a real pain when the check comes and everyone seems to have forgotten basic math. I made an iOS app for myself to solve the problem, and then my friends Ivy and Nicholas convinced me to polish it and put it on the app store. So hopefully other people find it useful too!