Thanks to Gavin Heaton for pointing to this. Slide sharing service Slideshare provides us with a look into its usage over the previous 12 months. If you are keen to see how many slides on average are being used by country, the longest slide deck of 2011, whether men post longer slide decks than women and which regions use Slideshare the most (plus a lot more) then this is worth a look.
I particularly like the way Slideshare has put this together. All companies sit on data that has the potential to be shared in this way. Just think what your zeitgeist report for 2011 might be.
And if you want to produce a great slide deck? The stats say that the average number of slides on a great slide deck is 65, with an average of 32 words per slide.