The Wonderful World of Kim Pine is featured in the Extras at the end of Scott Pilgrim vol. 3, a.k.a. Scott Pilgrim & the infinite Sadness in Hardback as well as Comics Festival 2007 and Scott Pilgrim Full Colour Odds Ends 2008.
It is a 4-page side story written by Bryan Lee O'Malley and, as indicated by the title, it centers around Kim Pine and also features Hollie, Sara, Emily and Tracy. It is set between Volumes 3 and 4. The story illustrates the monumentally dysfunctional relationship (or lack of relationship) between Kim and her three roommates and further sets up Kim's wish to move in with Hollie.