Is it safe to delete ALL caches and/or receipts?

is it safe to delete ALL files and folders under "user/library/caches"? I was surprised to see how big it has gotten. and is it safe to delete "macintosh hd/library/caches"?
how about receipts located in "user/library/receipts" and/or in "macintosh hd/library/receipts"?
how about unders "user/library/preferences"?
thanks for the help.

Regarding receipts, as already provided check these links.
http://docs.info.apple.com/article.html?artnum=25751
http://docs.info.apple.com/article.html?artnum=25768
Regarding the preference files at Home > Library > Preferences, these are the preference files for your applications and the Finder, etc. so if deleted for a particular application, this will require resetting your preferred preference settings for the application. If there is a preference file available for an application you have deleted, the application's preference file can also be deleted but these preference files take up very little hard drive space and cause no adverse effects if not deleted when the associated application is deleted.
Are you trying to free up hard drive space? If so, check this link.
http://www.thexlab.com/faqs/freeingspace.html

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