If they aren't listed in the applications list but appear on your home screen, they're part of the service books. You could delete them, but whenever service books are resent or you do a battery pull, they'll pop up again. They aren't the actual apps themselves though. They're links that take you to wherever you need to go to download the app and they take up almost no space at all. Not much purpose to delete these for space. If you want you can still hide them.
If the program is in your applications list then they can be deleted. If not, then they are just launchers to the download site which are pushed in service books and CANNOT be deleted, just hidden.
You can use CrackMem and/or Shrink-A-OS to get rid of preloaded apps as well as languages, games, default backgrounds, etc. You can also use BBFileScout to remove all sample media and unused ringtones.
Check out the links in my sig for these apps ads well as the "How to Increase File Free" thread in my sig.
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