I was talking to the postmaster in town and the buzz is Postage will be going up, again, in 2009 on packages. (Don't know about stamps, yet.) The local postmaster didn't know by how much, so I will have to see what the increases are and adjust. Still have books at the current rate, for a little while longer.
The official post office website has this statement on shipping price changes coming January 18th, 2009.
Update: May 2009 increases. Starting May 11, first class stamps will increase to 44 cents.