I went to install the translation Google Gadget on my site this morning and was accosted, or at the very least, very surprised by the number of Adult (porn) images and gadgets that were on the Google Gadget homepage. I simply went to the Google Gadget homepage and clicked on the Find Gadgets for your Webpage link. The next page lists a number of gadgets that you could add to your website, but the sheer number of adult-themed gadgets with pornographic thumbnails was alarming.
Gadgets typically include little segments of code you could add to your site to include: a clock, a Google Calendar, the weather, and more. It seems Google should tag the offending gadgets as Adult-only, NSFW, or R-rated and implement something along the lines of their SafeSearch to filter these things out by default. They could be included with a few more clicks, but I was disturbed to see such things come up so easily and readily on a Google page.
Below you can see a thumbnail of what I saw. There were 6 gadgets on the front page that were adult themed and 4 of them had explicit images as thumbnails.
Not all of these are Google-created gadgets. It seems the very least that can be done is something like a separate filter that I mentioned above. Google, being all-powerful, has little in the way of contacting the company about this.