You can do it all in LR. Assuming that all your photo folders are in some other folder, such as Pictures, or Photos, etc, highlight the parent folder in the left hand side of the library module. Then under the Library drop down menu, choose New Folder and give it your name, ie, Photos 2011. Or you can right click on the parent folder and choose New Folder. Then in the same left hand window, just drag an drop your date specific folders into the new Photos 2011 folder.
Brad