OK, I swear that dilemna used to be spelled with an n, but now I only see it spelled with two m's, even in the dictionary! Am I going nuts or has anyone else noticed it too? What's going on?!

34 years and counting, and I've never seen it spelled dilemna. It's always been dilemma for me.

60 years and still counting! I have memories of the "dilemna" spelling, and wondering how it was pronounced. The Shorter Oxford doesn't even mention it. It may have been in my youth when I was involved in Gilbert & Sullivan -- there's a song in Trial by Jury ("A nice dilemma/dilemna?") -- but surely it wasn't just a misprint?
Hello to all from Hobart, Tasmania, Australia.

two millennia and still counting! dilemma comes from a Greek word intact which means "two (2) lemma(s)" (a lemma is a proposition). I think you may be caught on the horns of one.