It's a clean sentence but doesn't make more sense. The screenshots fill in the blanks for me, as in it looks like you rebuilt Google Alerts with additional features for finding that content again later (tagging, notes).
If we were talking face to face and you said "This is the easiest way to find quality content" I'd follow it up with "what kind of content?" and "what problems do I have now in finding content?". I'd say "What problem of mine are you solving?" And the answer to that last question should be your tagline.
I changed the tag line into "Easiest way to find quality content". Does it make more sense ?
Not really. This is the tag line I saw, and all it did was confuse me. To be proper English it needs "the" at the beginning, but it still wouldn't really mean much. "Find", "quality", and "content" are very vague terms; what does it actually do? How can it be easier than Google (for specifics) or Hacker News (for broad news)?
The second tag line, "See the web the way you want it", is similarly confusing. I already do see the web the way I want it.
Some other things I noticed: The tour's quickly fading screenshots make it hard to follow, the "login" button on the tour page is different, the "Notifications" slide seems empty, the "any device" slide's images didn't load for me, and "Home" and "Tour" have horizontal scrollbars (my browser window is about 1030px wide).