Ok I was looking up more EX abilities to use in conjunction with the Factotums Cunning Brilliance ability. Here is what I came up with...
*Advanced Learning (Ex)
*Mantle (Ex)
*Sustaining Shadow (Ex) No need to eat, sleep, breathe, immune to nonmagical poison & disease.
*Elude Touch (Ex) Bonus to touch AC equal to Charisma.
*Unicorn Companion (Ex) Haha 1/day call a a Unicorn for 2 hours/level. The kicker is at higher levels we can summon a Lammasu, Gynosphinx, Water Naga, Androsphinx, or a freaking Couatl. (Psionic Plane Shift and Ethereal Jaunt AT WILL? Hell yes!)
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Now during my searching I came upon an interesting question which I do not believe I have seen answered. If an EX grants you a permenant increase of some kind, does that increase remain even after the 1 minute time limit. By strict RAW interpretation of the ability I believe it would work. It specifically states that you "gain the benefits and drawbacks of one chosen ability for 1 minute."
Gaining the benefit of the ability will give us a permenant stat bonus; however, one could argue that now that bonus point to your stat is a permenant addition and no longer attached to the ability. Therefore if the ability goes away the stat increase would stay. Obviously this interpretation is highly cheesy and more than likely it boils down to a legal terminology war. Either way here are some nifty abilities that could be useful assuming we can permenantly add stat bonuses.
*Dragon Augmentation (Ex) Permenant +1 to Str, Dex, or Con? Of course.
*Knowledge Focus (Ex) The effect is a permanent +3 untyped bonus to any knowledge skill. (All you gods of knowledge eat your heart out.)
*Expanded Soulmeld Capacity (Ex): Permenant +1 increase to your essentia capacity of your soulmelds. (Given time and the proper feats I see much abuse.)
*Totem's Protection (Ex) +4 untyped bonus on saving throws against supernatural abilities of magical beasts. (Once again this is a permenant bonus)
*Still Mind (Ex) +2 bonus on saving throws against spells and effects from the enchantment school. (Permenant untyped bonus.)
Please do correct me if there has been a Customer Service ruling on this or if my interpretation is blatently off.