The TSA has posted a helpful web site detailing what now not allowed on airplanes:
We encourage everyone to pack gel-filled bras in their checked baggage. We recognize the sensitivity of the issue and we are reaching out to key women’s medical associations to assist passengers and make information available to them while respecting their privacy. Passengers with medical gel prosthetics will be permitted through the security checkpoint.
Please keep in mind, that while we can not provide an exhaustive list of items that covering all eventualities, all liquids, gels, or aerosols of any kind are prohibited at security checkpoints, in airport sterile areas, and aboard aircraft. You can pack these items in your checked baggage.
We ask for your cooperation in the screening process by being prepared before you arrive. We also ask that you follow the guidelines above and try not to over-think these guidelines. Please pack liquids, gels, and aerosols in your checked baggage even if you do not normally check a bag.
The last thing we’d want is
sheep passengers who think too much.
The most depressing thing about that web page is that the fact that they bothered to create it probably means these rules are not going to go away any time soon.