This makes me think: why do people buy games they never intend on finishing? I hear friends of mine complain all the time that they don't have anything interesting to play, and yet they have a backlog full of titles that I'm sure they have forgotten about/don't care about/etc..
Now, as for my backlog..
Super NES
Yoshi's Island (I just started a new file again the other day..)
Super Mario RPG (a fairly new file: just got Mallow and was chasing Croco around the Bandit's Way)
Super Metroid (started a file to get 100%. Beat MotherBrain with 99%..)
N64
Super Mario 64 (I think I was trying to see how few stars I could finish the game with, without using the swtiches or secret stars..)
Paper Mario (Saved after saving the second Star Spirit, I think..)
Dr Mario 64 (I've never been able to finish any form of story mode with out losing or retrying)
Yoshi's Story (I have been trying to unlock all the pages for Trial mode. Cursed page 6-3..)
Mario Party 3 (Trying to get somebody other than Mario through the Story mode)
Gamecube
Mario Golf Toadstool Tour (I have been holding off on getting the secret characters. Outside of Boo, the selection kind of sucks..)
Mario Kart Double Dash (I've actually finished this one before, but I erased it and started over again because I abolutely can not stand the Petey/Boo team. (Boo is ok, but Petey is too friggin huge.. Burn his leaves off!)
Mario Baseball (I had to stop playing this game for a while because I was actually getting mad enough to throw the controller and biting my fiancee's head off. At the time, I had no idea there were so many rules for baseball [in real life], so going back and playing again, they have programmed it very well. I have yet to turn but a handful of characters into Star players)
Mario Power Tennis (I thought Toad would be unlockable further into the game, but I stopped playing after I realised that all my characters were Star players, and still no Toad..)
Mario Parties (all the ones for Gamecube involve similar things, so they're all here. I am in the process of completing them by earning as many points and buying as many things as I can in each game..)
Pikmin 2 (Two caves full of treasure are all that are left..)
Animal Crossing (getting the full catalog..)\
Wii
Super Paper Mario (going back and completing the two Pits of 100 trails, and possibly getting a few recipes. I don't know, though, because while SPM is a good game, I don't know how I feel about it being a Paper Mario title yet.. Something feels kind of off..)
Star Fox 64 (on the Virtual Console! This is one of two games that I downloaded that I haven't owned before. I haven't had the chance to finish playing through the one player mode yet..)
F-Zero (on the VC! See above for explaination..)
Kid Icarus (on the VC! I finally got through level 1-4!)
Handhelds
Mario Hoops (still playing through..)
Animal Crossing DS (completing catalog..)
I think that covered everything. It's not that I try and play all these games at once, it's just that I get bored sometimes with a game, so I randomly switch back and forth between the above titles, or just play whatever is nearby (my DS when I'm at my parents', like now).