Wow, great way to keep track of what i've seen. Before i was just using notepad. But yeah, since i just signed up most of mine are out of order of what i've seen, and i forgot when i watched them...some i barely remember what their about, but those are probably the ones i was less interested in, or watched all in one day.
I generally prefer the sci-fi/mecha anime's. other than that i prefer to watch Samarai one's. Mostly anything with a decent amount of action or comedy.