There's a fantastic blog dedicated to company offices called Office Snapshots that may tickle the fancy of those that like the Dropbox office: http://officesnapshots.com/
Stop doing stupid shit like that. Especially on 16:9 laptop displays, anything that eats vertical real estate gets nuked.
#header { display: none; }
#main { padding-top: 0; }
That style of menu is all over. Is your annoyance particularly on blogs that use them, or on any site?
With Stylish as a plugin on my browser, it's become disgustingly easy for me to attack annoyances. Including FWIW, Hacker News itself: http://stylebot.me/styles/2945
Buzzfeed was particularly fun: https://plus.google.com/104092656004159577193/posts/G6pzJBLK...
NY Times and Edge Perspectives: https://plus.google.com/104092656004159577193/posts/NUMQuQUh...
Basically: if it moves, is fixed, is an interstitial, or is just plain annoying, I kill the hell out of it. And with Stylebot, the easy stuff is just point, click, and "Hide". Then it's gone.
Bring it on.