also pertaining to rare drops, ectoplasm only drops in the UW, and obsidian shards only drop in FoW. the monsters in the UW include aataxes(which can knock out a squishy caster in two hits), smite beetles(smiting dmg), coldfires(water elemental damage), terrorwebs(fire damage), and memser-like creatures(dont remember their names). monsters in FoW are shadowlike, and come in every profession, there is also a forest full of icky nature-like creatures, and a cave with poison spiders in it.
there is actually a very nice guide to the UW in this thread:
http://www.guildwarsguru.com/forum/s...ad.php?t=67864
the entrance at ToA is much easier to use than the other one, which is located in Lonars Pass.