I'm really trying not to. I used it for Metroid Prime and seriously regretted it; the puzzles and overworld were so well constructed for a person trying to play with no knowledge and I bypassed all of that...
I'm waiting for a good new exploratory (Nintendo) game that I can enjoy without using a walkthrough. Since the Wii launch there's only been SMG and NSMBWii, which were good but too easy to need a walkthrough for anyway. I'm hoping SMG2 or Other M or a new Paper Mario at a long shot would fulfill this.