Pretty much anything by John Deacon would fit in nicely, but the aforementioned 'Millionaire Waltz' is a pretty good place to start. 'Another One Bites the Dust' ain't bad either, along with the one that inspired it - 'Le Freak' by Chic's Bernard Edwards (one of the best bassists of all time IHMO). Geddy Lee's work on 'Snakes & Arrows' was pretty impressive too and if fretless bass is your thing, check out Pino Palladino's work on 'Music For Chameleons' by Gary Numan . GM
Palladino also did some nice stuff on Don Henley's "Sunset Grill" (one of the only things from Building the Perfect Beast I really like) and on Dave Gilmour's second solo outing About Face. Geddy Lee's bass work on "La Villa Strangiato" is the thing which sold me on Rush in the beginning, and remains a favorite today. Edit: Just remembering one I'd forgotten to mention before, and a bit surprised no one else has brought it up yet: John Paul Jones on Led Zeppelin's "The Lemon Song".