Big list of RPG plots
It is a great list for sparking ideas for a GM who needs to come up with a plot in a pinch (or not in a pinch.) Only a few pages long, it strikes a good outline sketch of where the adventure should go. It depends on a good PC player group and a creative-light-on-your-feet GM.

Sorta relates to the earlier post about Games vs Stories. (i.e. don't jam your players down a specific path and expect it to go well.)