I just got Planar's PX2611 26-inch IPS-panel-based monitor and I thought I'd attempt to illustrate its wide viewing angle with a few pictures. However, the problem is that viewing angle is relative, so it makes no sense to show you a good viewing angle if you have no idea what a bad one looks like.
For comparison purposes, I also took some pictures of the HP w2558hc, another 26-inch monitor; however, it uses TN panel technology. Check them out here.
Look for a review of both the Planar and the HP monitors in a couple weeks. You'll want to keep watching this page.