If you guys want this consolidated into the catch-all then that's fine. I have seen some awesome things so far in GW2 and thought it deserved it's own thread.
After falling off a cliff and ended up in a level 15 area (at level 10) I saw an enormous ... thing ... in the background. I get up close, and this is what I start fighting!
Now granted I am only level 10, but if at lower levels you hit cool stuff like this then I'm extremely excited to see what's to come! After it died (probably 15 minutes or so) this is the chest that remained. Lots of good loot too!