Doug's AppleScripts for iTunes
In this site (which is known by a lot of iTunes users) you'll find all the scripts you need to automate your "usual and repetitive" iTunes tasks. Scripts are often updated (especially when iTunes gets updated itself), they are also organised by category which makes browsing through this bunch of AppleScripts very easy! So much scripts you'll find there, the search function will be very useful because if you need any script it MUST be there in Doug's AppleScripts for iTunes website.
I advise all iTunes users to bookmark that website in their web browsers.
I personnaly love the Assign Half Star Script (which enables a hidden iTunes function).

Downloads are very easy, you only have to click on the "download button" which comes just after each script's description.
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