AdWords = reklamní systém společnosti Google
approval bin = zásobník reklam ke schválení (tohle je oficiální překlad z jejich glosáře)

Nejsem si úplně jistý významem "message" v daném spojení (potřeboval bych kontext), ale pokud jde například o předmět emailu, tak bych navrhoval uvedené řešení.

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Note added at 22 mins (2009-06-25 11:34:51 GMT)
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Po dodání kontextu si myslím, že můžete můj překlad bez obav použít, mám s překlady pro Google docela velké zkušenosti.

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Note added at 19 hrs (2009-06-26 06:19:07 GMT)
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Pro nevěřící Tomáš:-)
Definice "Approval Bin" od Google:
It is best described as a web-based system.The Bin is accessed via a web link in the Ops Control Center. The main page of the Approval Bin allows you to "check out" ads to evaluate and then either approve or disapprove. This is where the name "Approval Bin" comes from. "Approval" describes the functionality of what we use the system to do. "Bin" refers more to how we think about what the system is - it is a receptacle, or a holding place, for all the ads waiting to be evaluated.Once you check out an ad, you will see it displayed on a page along with account information, keywords etc. From here, you check that it meets all of our guidelines and policies. If it does, you can designate it as OK to run. If it does not meet our standards, you can select from a list of disapproval reasons, offer ad improvement suggestions, and finally automatically generate and email to the advertiser explaining what is wrong with the ad and what he/she needs to do to fix it.After you generate and send the email, you can check out more ads or "Quit" the system to return to the main page or log out completely.