Ipix - The name Ipix apparently is now owned by Minds-Eye-View, Inc. (Ford Oxaal), one of the former competitors.
Some users in the community feel that Ipix has done a lot of harm to the panorama community in the past years. Read more on the issues with Ipix at old FFII page at archive.org.
The Ipix patent was upheld in 2001 in the case of INTERACTIVE PICTURES v INFINITE PICTURES but has also been challenged by Ford Oxaal of Pictosphere, aka Mind's-Eye View, who also holds patents related to panorama photography. In 2002, Ipix settled a lawsuit filed by Oxaal. In the settlement, Ipix obtained a nonexclusive license to Oxaal's patents. In 2003, Ipix initiated another lawsuit against Oxaal claiming infringement of the Ipix patent. In response to this new suit, Oxaal's lawyers filed this brief which contains several challenges to the validity of Ipix's patent. Apparently the case has not been heard in court yet (as of December 9, 2004).
On August 1st, 2006 Ipix files for bankruptcy - wikipedia.org