I will probably be one of the few people who would want the following collections, but I thoroughly enjoyed the games when I played them on the PS1 and PS2:
Pac Man World HD Collection: Pac Man World 1, 2 and 3
Brothers in Arms HD Collection: Brother in Arms: Road to Hill 30, Earned in Blood and Hells Highway
And on another note, I would also like to see an HD version of NFL 2K5. There hasn't been a decent football game since that was released, IMO.
Wild Arms Collection: Wild Arms Alter Code F, Wild Arms 3, 4 ,and 5
Level 5 Classic jrpg Collection: Dark Cloud, Dark Cloud 2, and Rogue Galaxy
Ape Escape Collection 1: Ape Escape 1,2,3
Ape Escape Collection 2: Ape Escape Pumped and Primed and Ape Escape Million Monkeys with online support