I've come up with a function to calculate the page that any particular comment is on, so after a comment post the site can redirect the vistor back to the very page (and comment) they just posted on.
This could be extended to a search hack where if comments are searched a visitor could be redirected to the actual comment on it's designated page rather than being forced to use "show all" flat style.
blogged on this here
as a working example, I've enhanced the last two lines of wp-comments-post.php and added the (incomplete) function as attached (I'll post code updated on the blog above as I have time)
