Mariah Carey - Without You (1994, Nilsson 1971)
Westlife - Uptown Girl (2001, Billy Joel 1983)
A1 - Take On Me (2000, A-Ha 1985)
East 17 - West End Girls (1993, The Pet Shop Boys 1985)
N Trance - Paradise City (1998, Guns'n'Roses 1989)
Marilyn Manson - Tainted Love (2002, Soft Cell 1981)
Whigfield - Last Christmas (1995, Wham 1984)
Atomic Kitten - Eternal Flame (2001, Bangles 1989)
[waits for some smart arse to point out that a couple of the artists I've named as original were actually also covers...]