It seems almost absolutely certain now that Insane in the Membrane will be unobtainable in Cataclysm
I write to you since you have the power to get the word out to most of the achievement hunters out there who are after this feat.

Here's my blogpost about it, quoting blues about it's removal and giving some advice on what the best course of action is:
http://rapidfirewow.wordpress.com/2010/10/26/insane-in-the-membrane-going-away/

Oh, and I never thanked you for your awesome guide, so here goes: Thanks! :)

Cheers,
Gav

Just added this to the site. Thanks again, let me know if you have anything else to add...

Thanks,
Cogsworth