I noticed the page on Quest at IFWiki was still about Quest 4, so thought I would have a go at rewriting it.
http://www.ifwiki.org/index.php/Quest_%28Language%29

And moved Quest 4 to here (but did not change it apart from linking back to Quest 5):
http://www.ifwiki.org/index.php/Quest_4

What do you think?

Thanks, looks very good - the old info was definitely very out of date.

I'm not registered on that site so I can't make any edits, so I thought I'd point out this little error I saw in your write-up!

Quest 5 is an authoring system designed for non-programmers and non-programmers alike.

Just a friendly heads up!

Thanks, sgreig; corrected.