I like the idea of the Emperor moving his consciousness from clone to clone, or potentially another individual. It fits in with the dark side philosophy of defying the force (using the force in a very Daoist sense). Obi-wan tells Luke in the beginning of Heir that he has already stayed too long. The Jedi accept death as part of life.

DISCLAIMER: Holy shit! I just realized that what I wrote above could be used by prequel lovers to justify some of the horrible ROTS dialogue! I do not, in any way, condone ROTS dialogue. END DISCLAIMER

I also like the Sith saying "May The Force serve you well" that was introduced in KOTOR as a nice expression of their philosophy and counter to the more familiar Jedi refrain. Disappointing that this was never uttered in the prequels.