The above link has the annoying function of forwarding you to the new site after 5 secs.
I used NoScript to disaable this!
Scroll to middle of page, links back to part one, but that script do`nt give you long enough to read the page... blargh. 
This one has a circuit diagram
http://www.kerrywong.com/2010/08/19/pov-and-pov-image-encoder/
And then there`s this from Our Evil Mad Scientist chappy..
http://www.dangerouslymad.com/download/chapter-8-pov
I know none of them are clock displays, but thats something to add when you have the hardware working.