Ive been using a Merlin Funnel Web IEC mains cable plugged into a Merlin Scorpion Manis Block for my 40gb PS3 for well over a year now and it has noticeably improved the sound and picture peformance, less noise/cleaner sharper picture, blacker blacks, whiter whites, more colours on screen, more variation of colours on screen etc, soundwise a fuller,deeper,wider, sounstage better seperation and a sweeter top end, hope that helps.
Ps many years ago when i was more than a sceptic about any sort of Mains Lead/Block etc and i bit the bullet and bought a Merlin Black Widow IEC mains cable i have to say on my journey of all things HiFi and Home Cinema it was one of the most revelatory experiences to see it work and the improvements it can make in a system, you will never go back.