change the name of the Trash

Unfortunately, the term "Finder" seems to be hard coded into the Dock... but you can still change what Finder appears like in other places. To change the name of any application, find the application in the Finder (or whatever else you want to call it), right click and choose "Show Package Contents". Navigate through Contents » Resources » English.lproj and open "InfoPlist.strings". Change the application name to suit your taste. Save somewhere safe, and copy to the original location. Keep the backup. Then relaunch Finder using killall Finder. Alternatively, entering defaults write com.apple.finder QuitMenuItem 1 in the Terminal will allow you to quit the Finder using command-Q.
Of course, you can modify any .strings file, which allows you to change the text for almost anything. But also note that removing a double quote could make the application/OS unuseable.

Message was edited (three times) by: semicolons

Well, it's fine on the strings level... it's when you upgrade to plists that you need to be a little careful... nibs can be really dangerous.

Absolutely. I'm betting though that once most, (not all), people have modded a system and it's been working OK for a while. If they do get some issue with something they either forget what they did to make the change or can't find the back up file.

Hmm, yes. But, of course, Time Machine should help with that.

There's a folder in CoreServices called SystemFolderLocalizations... the file to edit is in en.lprog

Weelll... if you can get it to work, fine. Well done. Awesome.