How to Delete Files in Mac OS X Snow Leopard
It's a good idea to clean up your Mac from time to time by getting rid of files you no longer need. In Mac OS X Snow Leopard, the familiar Macintosh Trashcan, to the right of the Dock, is where you put files pending permanent removal. In fact, it’s now a spiffy-looking wire can instead of the old clunker that the Mac faithful remember. You can click and drag the items that you’ve selected to the Trash and drop them on top of the wire can icon to delete them. When the Trash contains at least one item, the wire can icon changes to appear as if it were full of trash.
You can also add a Delete icon to your Finder toolbar.
The mouse isn’t absolutely necessary when deleting items. Your other options for scrapping selected files include
Choosing File from the Finder menu and choosing the Move to Trash menu item
Pressing the Command+Delete keyboard shortcut
Clicking the Action button on the Finder toolbar and selecting Move to Trash from the pop-up menu
Holding down Control while clicking the item to display the contextual menu and then choosing Move to Trash from that menu
In the adrenaline-inducing event that you need to rescue something that shouldn’t have ended up in the scrap pile, first click the Trash icon in the Dock to display the contents of the Trash. Then rescue the items that you want to save by dragging them to the Desktop or to a folder on your hard drive. (This is roughly analogous to rescuing your old baseball glove from the family garage sale.)