Even though I'm not an imager, I absolutely love looking at most of the pics the folks post here.
However, the one stand out image that has haunted me ever since I first saw it was the Sombrero Galaxy. It's been featured on APOD more than once, but this is the one that got me all giddy...
http://apod.nasa.gov/apod/ap011021.html
It's just stunning beyond words imo. Hope you folks like it too.
Edit:- whoops, just realised the thread is nebs not galaxies. Sorry!
Have I mentioned the Sombrero nebula recently?