I’ve been having trouble with my left iPod earplug, which has been clicking and distorting beyond a (relatively low) volume – making listening very annoying. I was making plans today to go and visit the Apple store where I bought the iPod, when I remembered reading something about sucking on the troublesome earplug. I gave it a go, and it fixed the problem! Just apply some suction to the earplug, and it seems to unstick something inside.
I couldn’t find the article I read that suggested this, but credit goes to someone out there for this quick fix.