Favorite thing: Some places in Nepal have good detailed coverage by Google Earth, and while Langtang isn't among them exactly, the impressions of the landscape given is useful in order to understand the general lay of the land. Check the pics, courtesy Google Earth!
The views in Langtang are simply fantastic, even the route into the Langtang National Park is amazing for views.
Fondest memory: My soon to be finace. I met him whilst I was teaching English in Langtang and we were inseperable for 6 months, so I am desperate to see him again when he comes to England September 01st