Here’s another useful keyboard shortcut for when you use Adobe Reader.  I get quite a few scanned documents emailed to me at work.  The problem is not everyone scans their documents the same way, or uses the same means to scan.  So I invariably get a few horizontally challenged papers when the program opens up.  Instead of tilting my head 90 degrees or having to click through the tool bar to find the ‘rotate clockwise’ or ‘counter clockwise’ (of which i always choose the wrong one adding even more clicks), I now use the CTRL plus SHIFT plus (-) or (+) to whip it ’round.  Furthermore you can use CTRL plus (+) to magnify your document (or CTRL plus (-) to reduce the size).