This has been on my list of things to post for awhile. Came up while generating all of Finn's crafter followers.
In line with all of those feats that give a bonus to 2 skills (such as Stealthy or Investigator):
Subject Matter Expert
You are en expert in your chosen field.
Prereq: Int 13+
Benefit: Select two Craft, Profession, Knowledge, or Perform skills that share a common theme, such as Knowledge(Nature) and Profession(Farmer), or Craft(Composer) and Perform(Sing). You receive a +2 bonus on all checks related to the two selected skills.