The quickest spot i've found is Urth's Fount in South Shroud at lvl 50. There is a group of water elementals which can be pulled and grouped together to be aoed down. You need a WHM in the group to aoe the mobs most efficiently with Holy, but you can still do it with other aoe classes. Make sure you set your choco on follow so that it doesnt attack the water elementals / heal you before they can be grouped together or it could mess up the pull. Here is a video explaining the technique:
http://www.youtube.com/watch?v=x1LOUv1IgzQ
The area can support two full parties if one party pulls and the other party dpses everything down. Both parties will receive the same exp.
You should really bring gear to soulbind to make the most of your time. You can fully sb a set of ilvl 45+ hq gear in less than 45min. I bring about 4 of each, neck, wrist, rings, earrings, belt, to sb and convert. I've made quite a lot of gil selling tier IV and III materias. Its probably the most consistent way of making profit currently.
Edited, Jan 15th 2014 5:33pm by OnyxFFXI