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I'm really, really surprised that MMORPG.com doesn't already offer something like this...or if they do, I sure as heck can't find it.
What I'm talking about is a list where we can add the games we've played, ones we're currently playing, and ones we're planning on playing...that shows things like our rating, favourites, active/inactive status, comments/reviews on each one, play period (from "x" date to "x" date), etc., etc. And your list would have a unique url that you can share with others.
I've got lists like this for Manga, Books and Anime, but I can't find a site that offers this for MMORPGs. I would really love to see something like this implemented here (MMORPG.com is by far my favourite site for MMORPGs) but for the time being, if anyone knows of a site that offers this type of feature, please let me know.