Google search people, Google search.
That only helps if you remember enough about a certain topic to throw into the search engine. For instance, my girlfriend and i were talking about sandwhiches last weekend (i was hungry) and i remembered the Extreme Sandwhich thread so i did a google search instead of loging on to the forums and going into general chat and searching for the topic (which would have all been slow because i was in a non 3g network area)..
i just did a google search and clicked one link, and presto! I gots me extreme sandwhich photos to show off.
Now, if i wanted to search for a specific remark about something not generally related to a specific topic and want to search by a users posts until i find that one specific post.. i cant!
But whatever, we're getting off topic.