I'm a new Mac user with OSX Lion. When deleting items in finder, I'm surprised that, unlike Windows, the computer doesn't automatically clean up the white space created by my deletion. So, in a file with many photos, there is a lot of white space between the remaining photos. How can I correct this without manually moving the photos? Thanks!
Use a view that does it automatically
Only the Icon view leaves empty space when removing items. List view and Column view in Finder don't leave space after removing some items. You can switch views in the View menu.
Select View » Arrange By » (anything) to group items by a specific criterion. It will automatically reorder items when some are removed. The desktop cannot be arranged.
You can keep items sorted by keeping Option pressed, and then selecting View » Sort By » (anything).
If you don't want Finder to keep a folder's contents tidy, you can manually invoke View » Clean Up By » (anything) after you're done.