A definitive stamp picturing a quill and inkwell in a patriotic motif was issued by the USPS on February 14, 2011, in Kansas City, Missouri.
"The inkwell and the antique writing implement combine to evoke the U.S. Constitution, the Declaration of Independence, and other documents of national significance," according to the USPS website.
I never gave the quill much thought, having been born into the Bic pen world, but the USPS site informs me that the quills were usually goose feathers, though other birds were also used as sources. (Perhaps a pigeon feather for a brief note? After all, not every writing of the revolutionary era could have been momentous.)
If you're going to collect the stamp you may have to settle for it on cover, commercial or first day: It is only available in coil rolls of 3,000 or 10,000. The price of those is probably more than your local stamp club members could raise by pooling their funds to finance acquisition.
The previous inkwell stamp was from the Americana series. That 1 cent stamp bore the legend "The ability to write: a root of democracy." Illustrator of this 44 cent stamp is Craig Frazier. Among his other work for the USPS, Frazier produced the 2006 Love Stamp and last year's Scouting stamp.
Stamp image © USPS