Hi,
Is it possible the API could provide diffs? Ie you provide two revision IDs, get a diff-style output back. This is something that is available through MediaWiki itself via the history page, but not the API.
http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/Diff.php?view=markup doesn't look like it is particularly straightforward to implement, and rather than doing so, couldn't it be made available via the API?
Also... a 'diff view' would also be much more useful in the page history feeds. As they stand now they seem quite useless to me.
Thoughts?
cheers Brianna