What it needs is a very simple UI, setup process for mass adoption. It's one of those things that makes people hesitate. Instead they opt for simpler stuff like Hamachi, Tunggle, etc.

I haven't used it in ages, if I'm brutally honest.

looks like a chat icon (someone's head and shoulders in silhouette). is it similar to kopete's? [edit: nope. no idea what it's reminding me of, but sure i've seen something similar]