I'm a big fan of the Idolm@ster series; I love the games, the anime, and the manga. I also enjoy editing wikis so I figured I'd help out around here.
I own Idolm@ster 2, Idolm@ster OFA, and Idolm@ster Platinum Stars. I've also emulated the SP games and play Cinderella Girls: Starlight Stage, Million Live: Theater Days, and SideM: Live on Stage. I've played the original Cinderella Girls and Million Live in the past. I've seen the Idolm@ster anime (the main one, not the mech one or the OVA) and the Cinderella Girls anime; and I'm currently watching Cinderella Girls Gekijou and SideM. I've read most of the translated Cinderella Girls manga that were around like a few years ago and am currently reading U149 which is focused on some of the younger idols (Koharu and Momoka are best).
So far I've fixed up the Million Live character pages by fixing most of the spelling and grammar issues and adding all their cards. I've also fixed the consistency of the Iori Minase (水瀬伊織 Minase Iori) stuff at the beginning of the Cinderella Girls character pages, added a lot of figures to the Idolm@ster Merchandise page, and added all of the Cinderella Girls manga that I knew of a few years ago to the Manga and Novels page.
Currently I'm just keeping the Cinderella Girls/Million Live/Starlight Stage cards up to date.
Here are some of my favorite idols-