I was setting up a new test VM at work, so I decided to have fun...and came up with (possibly) one of the greatest things ever. The trogdor ASCII art login screen.
Step 1 - search alt.ascii-art for "trogdor" on google groups
Step 2 - copy paste and save to a file on your server
Step 3 - configure SSH server to display a banner
The only down side is that my PUTTY window needs to be long enough to see the full awesomeness of this trogdor ascii art. I take zero credit for the ascii art, which you can find by clicking the google groups link above.
I'm kind of a newbie at configuring SSH, so I'm not sure if banners always display after you type your username...