It's interesting reading about other people's progress. For some people, it's a cathartic experience because they're finally writing out a story that has been living in their head forever. I can only imagine it as a security blanket that they're finally letting go. Because if there's one idea that keeps getting stuck in my head for years and years, I'd go mad. (This is what writing notebooks are for--to get those wormy ideas out as soon as possible.)
The ideas I come up for my Nano projects get developed the same year as that particular Nano. How I'm going to go about it might come earlier. For instance, I had already decided that I would write my 2007 Nano novel in first person after I finished the one in 2006. I thought that would be a good challenge to tackle since all my other novels up until this year had been written in third person.
As for next year, I'll probably decide after this one is finished. Maybe I'll take on sci-fi. Or a male POV. Or both.
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Notes about my current noveling progress: I'm finally in the last stretch. I'm still sort of vague about how the final confrontation will go though.
I don't forget little random ideas, but I don't write them down very often. I keep ticking over scenarios in my head for months, even years until the idea has evolved in to something that I may actually be able to fit in a story.
Of course, that makes me seem a little mad to others.