(Robert's Wikipedia page here; more reaction to his death here on kradical's journal.)
In the past few years, thanks to Alicia, I've gotten into his "Myth Adventures" books. I liked that Asprin would get into the politics and economics of his fantasyland (even demons and magicians gotta get paid, son), something a lot of fantasy authors never bother with. And of course, he was very funny, apparently even more so in person (when he didn't have to be PG or PG-13).
And on that sad note, I'm going the hell back to bed. I woke up early with a sore throat and the realization that I'd better stay home today, so that I don't get sicker. At least e-mailing sick notices means you don't have to speak.