Now for backing at different levels, you will get the following rewards: $1, you get access to all new works a day earlier than everyone else. $5, you'll also get a monthly mystery box (read: zip file) with some cool things that will otherwise be unavailable. Exclusive goodness! If you're backing, you should automatically be getting these new rewards already, but it may be worth it to edit your pledge just to check that you're getting what you pay for. I was unable to find out for sure from just reading the FAQ though.