Been lots of good, albeit short-lived ones.
Here's a few that i remember:
Ronaldo - Zamorano
Ronaldo - Vieri
Baggio - Vieri
Recoba - Vieri
Crespo - Vieri
Adriano - Vieri
Recoba - Adriano
Adriano - Martins
Ibra - Adriano
Ibra - Crespo
Ibra - Cruz
Milito - Eto'o
Ronaldo - Vieri was the best on paper. They were arguably the 2 best strikers in the world when we had them, and i still remember the way they ripped Verona apart on the opening day of the 99/00 season. They didn't play that much together though.
Ibra - Adriano was a similar case to this - on paper it looked awesome but it never materialised.
I liked Vieri - Crespo alot. Two number 9s, but they linked up really well when they did play together. That goal against Ajax was amazing.
Baggio - Vieri also good, i remember them playing brilliant against Roma i think.
Vieri - Recoba also worked quite nicely in 01/02.
Anyway, i'm interested to hear what others think.