Oooh. Â Old One, do you ever get on AIM? Â I tried and failed to learn GÃ idhlig, but I know a fair bit of conversational Welsh. Â I'm a Celtophile (with an interest in minority languages, to boot), but have very limited exposure to speakers of Celtic languages.
I consider "Undead" languages only those languages which have died officially and been resurrected (with new native speakers). Â Manx lost its last native speaker in the 70s but now has new (very young) ones. Â Cornish died in the 1700s but is now back (by some miracle). Â Welsh is thriving, and never has fallen bellow a few hundred thousand speakers, to my knowledge.
Another minority language I pay attention to, Jersey Norman (Jèrriais) is very close to dying, as well.  It has less than 4,000 speakers, I believe, though there are also speakers of other Norman dialects on the other islands and mainland France.  I think Jersey Norman is generally considered the dominant dialect now, however.
... I had almost forgotten about Coed. I write my name in Chinese now as "Sen lin" (Forest), though, so it goes on. =]