Domain Gadget Directory Manager (DGDM) - Keeping your Google Sites Clean

Setup
Although I first learned of DGDM from the GCT Group, I found a simple set of instructions on a Google thread here. As the instructions state, you add the DGDM gadget by URL to a site in your domain (I created a site called Gadgets). Press Save, and you'll immediately see the DGDM interface (screenshot). You can either go with a White List (only designated gadgets are visible) or a Black List (only designated gadgets are hidden). I chose to start with the White List option, since it would be easier to add educational gadgets rather than to constantly keep tabs on inappropriate ones..
Implementation
You can preview the directory through DGDM, and once you've adjusted your lists, the gadget did a pretty good job of implementing itself on our domain shortly after. This was one of those cases where I was amazed at how easy the setup was, and wondering whether I'm missing something or if there's a catch. It's still very early in the deployment, and increasing numbers of users are logging into Google Apps for the first time, so I'll be sure to follow up with teachers regarding any issues.
Suggestions for Improvements?
I'm also sure that I am missing some useful gadgets in our current White List filter. I'll be relying on teacher feedback to determine if there are additional ones to include. Unfortunately, they'll need to refer to an external Gmail account to peruse the possible gadgets. A useful addition to DGDM would be a suggested list of approved or educational gadgets that others have recommended. I'm sure users such as myself would be willing to help with recommendations. I would also be curious as to where DGDM came from, and perhaps a bit more information on how it all works. Overall, I'm happy with the solution, and I was really impressed with how easy it was to use. Solving the gadget problem has been high on my to-do list, and DGDM helped cross it off with ease.
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Comments
It's a lot of trial and error to see exactly what gadget I'm adding to the white list - is it by Google or a duplicate with ads. Having a screenshot of the gadget, author and comments would be great.
Other than that this is a very useful tool.
Best,
David