I just read the latest issue of the Underdark Gazette (yay!) and was immediately struck by the fact that we've got a load of modules with a real tangle of similarities (they're all listed with links in there):
You've got "Kiss of the Frog God," from Postmortem Studios as compared to Frog God Games, the publisher
There's "The Fallen Fane" from R.C. Pinnell as compared to the "Fane of the Fallen" from Frog God Games earlier this year;
There's "Fen of the Frog King" from R.C. Pinnell, which is out before my "Throne of the Toad King" that I've been blogging about (darn it)
And then (less bizarre, but still in there) is "Bone Mountain" with the skull face mountain on the cover, as compared to Black Blade's "Skull Mountain," but frankly I don't think you can HAVE too many interpretations of Skull Mountain: it's the classic challenge to design. :)
Great minds think alike. Bummer about Throne of the Toad King, because it was a real pain managing to get the title into the cover graphic, and I may change the name to avoid too much similarity.