The HITCHHIKER'S books are good, even if the final volume was so far removed from the rest. Any fan of Adams should also read the Dirk Gently books. LONG DARK TEATIME OF THE SOUL has some scathing things to say about the publishing industry; also read GOOD OMENS by Pratchett and Gaiman.
FWIW, I thought CATCH-22 was hilarious. I especially liked Milo Minderbender and Lt. (later colonel and, later, Lt. General) Scheisskopf--yes his name means what you think it means. Major Major Major Major is an interesting character in his own right, too.
A. Lee Martinez has been writing some good comedic books, as well.
Il en est des livres comme du feu de nos foyers; on va prendre ce feu chez son voisin, on l’allume chez soi, on le communique à d’autres, et il appartient à tous. --Voltaire