Coming back from Mexico last week I had a lighter confiscated, the agent told me you are only allowed one per person. I had two stored in my shaving kit. Not a big deal.

I agree with making everything as easy to see and access for the agents as possible. Also, read up on the rules at the TSA web site. Prep work ahead will save you a lot of grief at the airport, eg. liquids in the quart sized plastic bag. The goal is to make the agent's job as easy as possible to examine your stuff.

You may wish to consider simply checking your bag if you are concerned with some items. Carry on the most valuable items and check the rest.