Deep Blue Something - Breakfast at Tiffany's
Cark Douglas - Everybody was Kung Fu Fighting
The Clash - Rock the Casbah
The Connells - '74-'75
Cornershop - Brimful of Asha
Crash Test Dummies - Mmm Mmm Mmm Mmm
Edwin Starr - War
Fool's Garden - Yellow Lemon Tree
Inner Circle - Bad Boys
Irene Cara - What a Feeling
Jock James - I Like to Move it
Kris Kross - Jump
Liquido - Narcotic
Manau - La tribu de Dana (might be just Europe, though)
Matt Bianco - Get Out of Your Lazy Bed
Mr. Oizo - Flat Beat
Norman Gimbel and Charles Fox - Happy Days
Scatman John - Scatman
Skee Lo - I Wish
Snap - I've Got the Power
Snap - Rhytmn is a Dancer
Sniff 'n the Tears - Driver's Seat
Snow - Informer
Spin Doctors - Two Princes
Steppenwolf - Born to be Wild
Supertramp - When I was Young
Survivor - Eye of the Tiger
Tracy Chapman - Fast Car
The Verve - Bittersweet Symphony
That's about all the 1-hit wonders I have in my playlist
Edit: I actually have quite a few more, but those are mainly dutch/belgian one-hit wonders (technotronic, 2 unlimited, ...)