Nice one Ed, make the document public somehow I think?
Go to the Share tab of the spreadsheet (you must be the owner or a collaborator with sufficient rights) and tick on the Share tab the Advanced option : 'Anyone can view/edit this document WITHOUT LOGGING IN at:' Make sure you select 'edit' instead of 'view'. Now you can copy and distribute - e.g. on a web page - the URL you will find after this ticked option.
Nice one Ed, make the document public somehow I think?