There’s a great little article at Gnome Stew about switching from rules-heavy games to rules-light games. Being one who likes to try a plethora of various RPGs from time to time, and in particular a lot of the new indie games, I found this article helpful, if even just to reinforce the conclusions I’d already come to.
One of the unexpected results of jumping to a rules-light system is that the GM has to answer many of the questions that come up in play. Another way to put it: Actions still have consequences; there just aren’t tons of rules explaining those consequences, so your workload may increase. In the long run, this is a good thing because of the flexibility it brings to the game, but for there is some on-the-job training.
via Gnome Stew