Professor P. Foglio frequently includes humorous references to other webcomics in the panels of Girl Genius. The Professora has started tagging these as "bumps for other webcomics" in the LiveJournal echo site. The following comics have all been mentioned at one time or another. Occasionally, other artists pay playful verbal or visual homage to one aspect of Studio Foglio's work or another. For sake of balance, these "shoutins" are included below the shoutouts. __TOC__