Apple-folks, I was asked how to post Keynote presentations to the web for students to review.
First, know that Keynote files are Apple-only. There is a simple export function that will allow you to convert your Keynote presentation into a PC-compatible Powerpoint file. Under the Share menu, choose "Export", and then select Powerpoint.
Second, know that Keynote files are not files in the way that we normally think of files, they are containers. That is to say, a Keynote "file" is most similar to a folder. Your Mac knows that this folder belongs to Keynote and that everything inside of it is related, so it treats it as a file - but not all applications know this, and other computers certainly don't. This is why it is sometimes difficult to email a Keynote file; it's like emailing a whole folder - which can rarely be done. And this is why you cannot simply post a Keynote file to your website or CatLink (our in-house Moodle install, for our outside readers).
Back to the original question then, how can we post Keynote files to the web for students? I recommend converting to PDF. You could do it through the Share menu and the conversion dialog shown above - simply choose PDF instead of PPT. This will put one slide on one 8.5x11 page, if students print. That strikes me as wasteful, and so I recommend using the Print dialog, and placing multiple slides on a single piece of paper.
Begin through File > Print, and then follow the screenshots below.
At the PDF button (step 3 above), choose "Save as PDF." This will result in a PDF suitable for students to print, whether they are on Macs or PCs.
As always, if you have questions, please let me know.
Because Keynote is different enough from Microsoft Powerpoint, and more Mac-folks are using it now, I ran three sessions of a workshop for the application last week. The Apple 
