Google is now clearly showing if a keyword is trademarked or not, directly in the Google AdWords Keyword Tool.
For example, a search on "iphone" returns a little ™ symbol near the term, i.e. iphone™. Here is a picture:
This can greatly speed up the process for advertiser who are looking to avoid trying to bid on trademarked terms. I am honestly not sure the exact details of why this was added, so these are all assumptions right now.
Hat tip to Gabs and Kasia Bauer for notifying me of this.
Forum discussion at Search Engine Roundtable Forums.
