This first guy goes into great detail on various aspects of his layout, creating how-to's and generally talking along as he works (w/ appropriate editing). All organized into convenient playlists and very up-to-date.

http://www.youtube.com/user/thebige61

This fellow has a great setup in the attic and goes over various aspects of his layout. Most impressive are his tressels, all hand built. Some really amazing stuff. He seems to post a couple times a year and looks like he is due very soon for an update.

http://www.youtube.com/user/ennout

Both guys are N scale and you can find some other good youtube links from them as well.

This stuff makes me wish I owned a house!!!
Enjoy.