The "Netscape (Communications|Commerce|Enterprise) Server" is a product that as far as I know, no longer exists under that name. Long since rolled up into iPlanet and now SunOne. But I still run into sites that inexplicably have the Netscape logo as their favicon, in spite of having no connection to Netscape/AOL/Whatever. This apparently because they are still using Netscape Server, and it comes with the Netscape favicon by default.

Prime example: The Toronto Star, which also happened to be linked from Slashdot today.

For a long time, the U.S. House was sporting the "N" , but recently (as in just this past month) they seem to have finally come up with a favicon of their own.

Meanwhile, the U.S. Senate appears to have the Sun logo.