I love World Creator, especially the vegetation distribution pipeline. You can create some very realistic fields with it. Im going to check out impostors too - ive seen it a few times and wondered what it's about.
Stupid Rental. My Zbrush that I haven't paid for an update in years and is perpetual Trumps that on all counts.
Facial Rigging Balancing Quality & Control Part 3 of 7
Part 3 of the webinar touches upon the problems of having to many controls in Faceware and creating high quality face rigs.