I had previously written that I tried GhostDoc but removed it because it didn't write very useful comments. Well I re-loaded it today because it does have one very handy feature: Adding comments to classes that implement interfaces. It's incredibly tedious to copy comments from the interface code to the class code, but with GhostDoc you just have to right-click on the class member and hit "Document This" and it will automatically bring the comment from the interface to the class. Pretty cool.
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