Yeah, I agree, it was a lot of fun and very cool meeting people, especially Shannon, the first person from JGO I've met in person.
The technology thing was a big problem for me too. I spent the entire first day wasting time trying to get a pirated copy of Windows onto my Macintosh, with no resources around or blank CDs or anything, all because my group wanted to use XNA (which, after using it, is highly overrated in my opinion). This meant that I was probably only able to spend a solid 8 hours or so programming, which is really not much.
Next year I'm sure things will be much more streamlined, and having experienced things once I'll know this time what I view as important in my group members. First and foremost is the technology, I think. Had this been in Java or Unity (ironically enough, 3 separate groups used Unity, but it just so happened I didn't end up in one of them), I could have produced 5x or 10x the output. Then again, it's sort of good being forced to learn new technologies, because so often I tend to avoid doing that.
My own ego sort of detracted from this experience for me, unfortunately. I was working with two neophyte programmers who nonetheless got more done than me, because they were both very familiar with XNA. So I sulked and felt bad about my own ability - I like to be one of the best. These sorts of experiences can very bluntly show you your own dark side, which can help in getting rid of stupid habits. Hopefully next year I'll be less of a dick.
Anyway, despite me bitching (again) on this forum, I highly recommend GGJ. Just like Shannon, however, my game is totally not worth downloading, so I won't share it here. We pulled off everything we wanted to but it turns out to be a nightmare to control. Oh well. We had a cool idea and we tried it out, and that's worth plenty on its own, regardless of the result.