Cayra.NET, a developer of a new mind mapping/concept mapping application, has just announced the availability of a Cayra maps online viewer. At first, I thought this was an application that allowed anyone to view Cayra maps, even if you don't have the program. But in reality, it appears to be an online repository, where you can post and share your maps with others.
You can easily upload your maps here, but I had a hard time figuring out where the main map library page is that lists all of the maps uploaded so far. Apparently you must share at least one map in order to view the file library.