Shufflesome stickers are mentioned as "seriously cool stickers" on page 86 (that's page 44 of the PDF).
There is a huge section with iTunes Tips & Tricks in this comprehensive 230 page publication. Reach inside.
Noteworthy: User-driven prices matter.
Browse by month:
April 2009,
March 2009,
February 2009,
January 2009,
December 2008,
November 2008,
October 2008,
September 2008,
...