Any wool or felt quilters onboard?

On impulse while fabric shopping I picked up a package of felt. I've admired wool applique quilts for a long time and thought it would be fun to give it a try. But I'm not finding as much information as I'd like online and was wondering if anyone had any good URLs they'd be so kind to point me towards? Or also discussions of the technique? Problems? Tips? Warnings? I found one site that mentioned how to wash the felt first but it was fairly confusing to me.