[pbhjpbhj]

You should also use a fixed page width IMO, something like http://www.blueprintcss.org/ will help keep a text alignment grid and sort out your colums too, see the CSS file generator at http://kematzy.com/blueprint-generator/ .

I disagree on the "popular worksheets" idea. I think most will want a specific form of worksheet rather than the most popular, an option to sort by popularity would be good. You might want to look at table sorting in JQuery (eg http://tablesorter.com/docs/#Demo ).

Twitter? Use the twitter bird! A picture is worth 1E3 lexical tokens.