Norman Maclean was snubbed by the Pulitzer committee in 1977 for A River Runs Through It. Despite being passed over for the award, though, Maclean got to live out what I think is many, many writers' dream. Maclean himself described it as "Probably the only dream I ever had in life that came completely true."
Go here, to the always-worthwhile Letters of Note blog, to see for yourself-- but you might want to queue up the Cee-Lo Green first. (Cee-Lo is NSFW.)
(*A pet peeve of mine: it's pronounced "PULL-litzer," not "PEW-litzer.")