When I come across a post that seems familiar or otherwise likely to be plagiarism I pick a distinctive phrase out of the post and do a google search like this:

"" site:bitcointalk.org

And if there is more than one result then I report the post and in the comment field I mention the number of hits returned by a google site search of the key phrase. This is less cumbersome than trying to put a link in the comment field to an identical post, especially when there might be *hundreds* of identical posts to choose from.

For example, the last post I reported had a peculiar phrase in it that I had seen before - "mining and swimming pool" - so I did a google site search of that phrase and it turned up 110 posts that were all identical (make that 113 posts as of now... busy little spammers!).