The "Better Finder" series is indespensible. Creators and Types was essential in OS 9, but still has a valuable function in all versions of OS X to date. I sometimes wonder how I could live without it, at those times when I have to make batch changes to the file and/or creator types. I use this in conjunction with Rename (my favorite module to the series). The developer supports his software, makes regular updates, and indeed honors his "Forever" upgrade. Personally, I believe in supporting shareware, and the author's pricing is utterly reasonable considering how useful these tools are.