I once was pointed to an internet site for a company which made
projection screens for computers/TV.  However these screens were
unusual in that they were shaped like 7/8 foot concave discs and were
held vertically at floor level in combination with a chair-like
contraption such that the user would be partly 'surrounded' by the
screen in all directions.  The image was displayed by a projector at
the user's feet.  I would like to investigate these devices further
but I've now lost the address for the site and after extensive
googling still cannot find it.    I recall the site was quite
professionally done if thats any help.

Try Hammacher Schlemmer catalog. Think I saw it there a few months ago.

You porbably saw it here:
http://www.howstuffworks.com/elumens.htm

The Elumens's web site is here:
http://www.elumens.com/