muting start-up sound on Lion How can I permanently mute the start-up sound on Lion?

StartupSound.prefPane isn't compatible with Lion. I found Psst, and I guess it's the best option, but it still looks like a hack. Any better ideas?
Before I start up my MacBook in the library, I plug in a headset or earbuds (from my phone or iPod).  Hardware mute.  Works with either OS.