For those new to patent searching, here's a quick example of how to see what issued US patents are citing IP.com publications, or other references. Yes, the PTO is increasingly turning to IP.com in its prior art searching.
A quick answer is that you can search for the string "IP.com" in the search field for "Other references" in some search tools such as FreePatentsOnline.com or the USPTO.gov search engine, though some search engines make it more difficult.
The video below is 480 pixels wide to fit on this blog. To see the full-screen presentation at higher resolution, click on the full-screen button in the lower right corner of the video. To see it in a new browser window, click here. It's about 9 minutes long since I show you some results and pontificate a bit on defensive publications and IP.com as a resource.