This one will always have a special place in my heart since it really features the IL-Series Cylons so much. Therefore I always call that one the "IL-Series episode".
It really had some great moments and it was fun to witness the ongoing word battles between Baltar and Lucifer and Lucifer's contempt for Specter.
If they only got more time to prepare everything more carefully during production of the series, I'd have loved to see more episodes with the Cylons getting in the spotlight like that.
Oh yes, and scratch that awful rhyme/song sequence next time you'll do a Cylon-themed episode!
