Jack of All Trades

(Song and Silence: A Guidebook to Bards and Rogues, page 40, DnD 3.0)

[General]

You've picked up a smattering of even the most obscure skills.

Prerequisite

Character Level 8

Benefit

You can use any skill untrained, even those that normally require training and those that are exclusive to classes you don't have. You cannot, however, gain ranks in a skill unless you are allowed to select it.