A great new page has been added to the fantastic XPages.info site and it brings together many examples of XPages applications to one place.
It's a great sampling of what's out there, some of which I haven't seen before, and of a range too that will help you learn new stuff and how things can be done with XPages.
There are four main demo sections (see here for more info)...
And if you got a XPages demo that's not there do make contact with the people at OpenNTF.