This entry was enough of an improvement on Tip #3751, Rename Blocks, that we thought it deserved a new entry spot. Tip #3751 allows you to rename a block in AutoCAD by picking the block to select it. This is especially handy for pasted in blocks whose name is usually something like A$CFG5D32S.
This entry provides two big improvements. The first is that you can select the block before executing the command, and the second is that you are prompted to rename the block in a dialog box rather than at the Command line. After you load the AutoLISP file, the command name to execute is RB.