ToolbarTrash is a freeware utility that puts a trashcan into the Mac OS X window toolbars.
It works a little different than the toolbar's delete icon, in that you drag items to it, and you can click on it to open the trash. Included are several alternative trash icons as well as the standard OS X one.
What's new in ToolbarTrash
Version 1.0.1 adds the following:
corrected a bug where dragging items to the ToolbarTrash
would fail in windows set to column view