Nicole Simon posted a request on FriendFeed for a bookmarklet that would search for the selected text on a page, so you could find who posted it first on FF.
I tried posting a reply on FriendFeed, but the comment kept breaking the url, so here it is again. Drag this link onto the browser toolbar & it’s all yours.
Best thing though is that Aviv posted a comment saying that this will soon not be needed:
No need for a bookmarklet… a "Find others" button is coming
Sweet!