I just had a thought concerning a Half-Fae Warlock I'm building: if the Half-Fae template grants him butterfly wings for flight, and butterflies aren't exactly known for having audible flying sounds. Which got me thinking: Depending on whether or not flight warranted Move Silently checks, combining Walk Unseen (invisibility at will) with Entropic Warding (24 hour Entropic Shield and Pass Without Trace) could make him an unparalleled stealth player.
Which begs the question: Does flight usually warrant Move Silently checks? On one hand my Warlock's butterfly wings might not make that much noise, but on the other hand, he might still need to avoid bumping into things or upsetting nearby objects with gusts from his wings. Which is it, then?