@thomthom said:
When OSX unpacks a zip files it always unpacks them into folders that has the same name of the zip. DO NOT move these folders into your plugins folder. Move the CONTENT of these folders into the plugins folder.
You should have in your plugins folder a file tt_selection_toys.rb and a folder TT_Select_Toys. You should also have a TT_Lib folder which contains a set of .rb files and some more stuff.
That did the trick!
Sorry for asking such a newb question 
I love the concept and potential usefulness, but I have a slight issue: I can't seem to get it to work (specs on the sidebar). I haven't messed with any of the files or their locations within the folders - I simply unzipped the files provided and then drag & dropped the folders "TT_Lib" and "tt_selection_toys" into "Macintosh HD>Library>Application Support>Google SketchUp 8>SketchUp>plugins".
I don't get an error message when I launch, though.
I also tried copying the same folders to the SketchUp 7 equivalent of the plugins folder ("Macintosh HD>Library>Application Support>Google SketchUp 7>SketchUp>plugins"). Same result - no "Selection Toys" shows up under the Tools drop-down menu, but no error message appears, either. That folder only contains the standard plugins from Google (Ocean, Examples, and Utilities) so it's not an issue of plugin interference, either.
I've no idea what else I should try doing but would really like to use this; thanks in advance, both for the advice and the (massive) coding.
Thanks for the script! I'm sure it'll come in handy 