How can I delete all files/subdirs except for some files in DOS?

I'm looking for a DOS script to delete all files and subdirectories in a root directory except for a set of batch files (*.bat) that are in the root directory. Any DOS jocks out there that know an easy way to do this?

Update

Thanks for your help everyone. This is where I'm at now (see below). I'm using Ken's suggestion for the delete of the files. I would like to know how I can stop this script running if the del or RD commands fail due to a lock on a file/dir. Anyone know how? Right now, this script will do a bunch of things after the deletes and I'd like to stop the script if any of the deletes fail.

@echo off

REM *********************************************************************
REM *  Delete all files and subdirs except for batch files in the root  *
REM *********************************************************************

REM Delete all files in current dir except bat files.  Does this by a) setting the attributes of *.bat files to 
REM readonly and hidden, b) deleting the rest, c) reseting the attributes 

attrib +r +s *.bat
del *.* /S /Q
attrib -r -s *.bat

REM Deletes ALL subdirectories 

FOR /D  %%G in (*) DO RD /s /q %%G