Will an update to iTunes 10.6.3 delete my music and videos?

Will an update to iTunes 10.6.3 delete my music? Is it worth downloading because it brings some new feature or improves handheld devices? Because I don't own an iPhone or iPod anymore.

No it won't delete anything, and there aren't really any noticeable improvements, so I wouldn't bother.

No. Updating iTunes does not affect the content in it. Nothing is wrong with having the latest version of the software you are running.