I have a serious problem with this. since purchasing my wii last year, i've only finished Zelda TP after 80 hrs.
My rundown:
MP3: 47%
SMG 55%
Z&W: 20%?
sonic: 30%

 With okami, fatal frame, RE4 and NMH i want to buy, i don't know how i'm going to finish the games. Someone give me advice. 

Well when I buy a new game, I stick with it until I complete it. After that, I'll play like 2-3 different games that I've finished before, until a new game I'm interested in comes out. Right now, I'm replaying FFX, Kingdom Hearts and Warhawk. When Persona 3:FES comes, I'm putting the 3 games aside, and focus on Persona 3 until I complete it.

I'm usually playing 4-5 games at any given time. Right now it's:

Fallout
Condemned 2
Psychonauts
... and I'm always playing Rock Band.

YES.. for example if i get tired of grindin in Final Fantasy IX, i move on to play guitar hero 3, or i play super mario galaxy to relax

Usually 1 game at a time although right now im playing Crisis Core on psp and ff7 on psx, so many contradictions..........