A coworker of mine mentioned these to me the other day. I dunno about you guys, but I like to listen to music when I'm working on stuff. But, I also use tools that are way too loud to not wear hearing protection. So, I end up usually just wearing ear protection and go without the music. Well, with these little dealybobs you don't have to accept a trade off. Its a rubber boot that fits over your earbuds and acts like an earplug, but allows you to listen to your music. I haven't tried them yet, but I think I'll probably be ordering a pair soon. FYI, they are not the cheapest earplugs @ $13 on amazon.
ACOUSTIBUDS - Earphone Adapters