Try this, http://www.guitartricks.com/helptab.php . It's straight from the horse's mouth. :D
There's bunches of internet hits to be had for more detail, e.g., http://www.how-to-play-electric-guitar.net/tab-symbols.html and http://www.ultimate-guitar.com/lessons/for_beginners/guide_to_tab_notation.html . Do a Bing or Google search if you need more and don't forget to search the "Images" pages...you might find some printable charts there...
"It takes a lot of devotion and work, or maybe I should say play, because if you love it, that's what it amounts to. I haven't found any shortcuts, and I've been looking for a long time."
-- Chet Atkins
-- Chet Atkins