Because I love using pretty postage stamps on my envelopes, I got myself a copy of the US Postal's Guide to US stamps. The 37th edition contains US stamps released all the way up until 2010, and is a great way to look up the Scott #'s and release dates of my vintage postage. It's also a good way to find others that I want to add to my collection as they include color images of each stamp.
To purchase a guide like mines, check out the US Postal Service online at: usps.com
The Hawaiian Rain Forest stamp designed by artist John D. Dawson graces the cover. It's so beautiful!