Here is a chart to the new media mail rates if anyone is interested.  It is particularly helpful if you use an APC for your postage because APCs don't tell you the media mail rates, you have to know them in advance:

http://www.usps.com/prices/media-mail-prices.htm

thanks, i will need to print this out and keep it with me. i might even laminate it and keep it in my wallet

I created a Google doc that lists the First-class rates (for smaller books) and media rates.  You can find it here