
As of this morning, the TSA is now "prohibiting any liquids, including beverages, hair gels, and lotions from being carried on the airplane."1 They advise transferring these items from carry-on to checked baggage.
Some exceptions were listed on their website:
The following items are permitted to be carried aboard the aircraft:
1 Statement By Homeland Security Secretary Michael Chertoff Announcing A Change To The Nation's Threat Level For The Aviation Sector
Photo compliments CNN.