Throughout this week and next, Gamasutra is presenting a year-end retrospective, discussing notable games, events, developers, and industry figures of 2007.
Picking out the five "best" trends is pretty tough. Almost more than ranking games, judging the positives and negatives of any of these trends is an exercise in subjectivity.
Some trends are good for business but could easily be argued to stifle creativity. Some might have no positive or negative effect, or fade away as fast as they arose. But these trends all seem significant and compelling in their own way.