It is hosted on Issuu, a web site which allows you to create online newsletters etc. for free. Its well worth checking out if you are wanting to create online versions of paper publications.
Its a nice format because it allows you to virtually flip through the pages and you can resize sections etc. if you want larger text.
It is a bit strange to start with because it doesnt work quite like a PDF and so it may not be immediatly intuitive - but take a minute or so to play with it and it soon makes sense!
Could be a really useful tool for other publications.
We got the idea from Sharon Tuersley at Warwick University, who used it to produce the Warwick University Library Newsletter, which can also be seen at: http://issuu.com/warwick_library/docs/97257_library_newsletter_final_
Anyone using it already or using similar services that have been useful?