Being a lover of type, I'm also really interested in Ambigrams.  For those who don't know, ambigrams are basically words that read the same when flipped upside down.  Here are some examples:

Sonali (name)

The Princess Bride (awesome movie!!!)

word illusion logo by Tiffany Harvey.  This one is outstanding because it is so easy to read.  Some designs are not as obvious.

The most famous ambigram artist being John Langdon of The DiVinci Code Angels and Demons fame.

This is a good article on how to make one.

Making an Ambigram

Ambigrams make you really examine the letterforms and think out the process.