I played a bit with the site and liked it. The one killer feature I might pay a few dollars per year for is to create a profile, with a few graphs attached and

I played a bit with the site and liked it. The one killer feature I might pay a few dollars per year for is to create a profile, with a few graphs attached and get a daily or weekly email when a new paper is published that fits well into one of my graphs. Feel free to add a monthly "the most important old paper that you have not read yet (or not read in the last 5 years)" email too.