United States Postal Service increased more than just the postal mailing rates on May 14, 2007.  Rates increased for Insurance and Delivery Confirmation, which are often used on eBay auctions.  The insurance rate for up to $50.00 went up the most, with a $.30 increase from $1.35 to $1.65.  Delivery confirmation now has 2 catagories: Priority Mail ($.65 at the Post Office) and Parcel Post ($.75 at the Post Office).  Rates for postage also changed but one thing that is not being publicized is that manila envelopes and mailing envelopes with Delivery Confirmation added are charged at the higher first one ounce rate of $1.13 as opposed to $.90.  Complete rates for all services can be viewed online at the official USPS website, which can be reached through the eBay site map.  EBay does not allow links listed in the Guides so I cannot list it for you here.  I hope you find this information helpful.