Neon lamps don't last forever. If it's 10-15 years old, it's probably just starting to fail.

An interesting characteristic of neon lamps is that as they degrade, often they'll glow steadily again as long as you're shining a light on them. (Makes them kind of useless, I know. :)

Thanks for the replies. I think I'll install a new switch and see what happens.

Before replacing the switch you should see what it is controlling.

If CFLs have replaced incandescent in the fixtures switched the neon light cannot get any current to glow.

Hi my name is Jon and about your flickering wall switch it does not mean to much. I grew up in a house that had all lighted wall switches in it and 4 of them throughout my house always flickered 24 hours everyday and they never broke or burned out and there was nothing wrong with the lighted switches and it does not mean anything other than a small glitch in the switch. My friend Marry Beth also lives in a house her whole life to that has lighted switches that flicker to and hers have lasted just fine to. You have nothing to worry about what so ever.

I had this problem and this site helped (I just changed the bulb to "old style" ) http://willnicholes.com/cflswitches.htm

i had the same problem, so i read the back of the package box and it clearly says, does not work with CFLs or LEDs. Hope that helps.