What is user's library/caches used for ?

It appears to not to be backed up by Time Machine - which can not show anything earlier than the latest version.
It contains items that suggest that it is regularly used by Apple software (e.g., Safari - for bookmarks?)
It appears to be used by some manufacturers (e.g., Garmin) for device software updates - including a very large one that used 2.3 GB and stayed there after the Garmin map update was installed. (I was running low on hard drive space, so I took a deep breath and deleted that 2.3 GB file)
What negative consequences could occur from deleting items from that Caches folder?
(Caches may be seen in Time Machine by opening the user's "home" older in Finder, holding down the option key while clicking Go then Library, then clicking Caches, then Entering Time Machine. After the window settles down, only the latest Caches window and one other mysterious item will remain.)
I am using OS 10.7.3 on a MacBook with 1.83 GHz Intel Core 2 Duo, purchased in December 2006.

The answer is complex.
I keep ALL my User files on a Home Mac OS X Server. This is a setup that is used in schools with fixed Macs.
• any User can use any Mac, and their files appear when they log in. (The User files are stored on the Server).
• any Mac can go out for service, and the User files are not an issue.
• with all User files on the Server, backup the Server and you have backed up everything
When using such a Network, all the Cache files go on the Server as well. This is a known performance issue that can slow things down a bit, so Server Admins have been fooling around with User Home Redirection, and especially User Cache redirection for a long time.
With the coming of 10.6 Sever, a new set of features was added that allows the Users Caches to be automatically redirected to the local workstation on login. Since that might be a security problem when the User logs out, there is an option to delete the caches on logout.
Works fine. No issues except the ones I mentioned above.

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