To gain a free slowfall buff, head towards the Twin Collosus's in Feralas, and to the left of the road will be an npc named Marli Windrunner. She gives a quest and teleports you to the top of the mountain where a vendor sits to sell you a slowfall buff item. I just thought that maybe the slowfall buff could be used when making a big jump, then from there use a noggenfogger, or slowfall, etc. Save your mats / nogenfogger and get an assured slowfall.... Happy Exploring
ImageShack - Hosting :: mapxu8.jpg = On top of mountain, at vendor.
ImageShack - Hosting :: parachuteud1.jpg = Parachute vendor. (item costs 20s)
ImageShack - Hosting :: marliwindrunnernw4.jpg = Marli Windrunner, right next to road. Speak with her for a quest to get the slowfall item.
Also, I found this myself, searched for feralas + slowfall + twin collosus found nothing, have fun!