I don't think that the forum format facilitates that.
Actually, you can search the forums. You can search a specific forum (like the AAR one) by name, looking through the titles and/or the messages. The results can be sorted by date, author, title, etc.
The big advantage to putting AARs in the forums is the discussion. An AAR can be discussed and commented on, which is really what AARs are about, really. Other players can add their input, pointing out good moves and mistakes, hopefully improving your game.
Something that I obviously, desperately need.
I took a look at the Socal ASL AAR site, and while the formating of the AARs are far superior to what can be acheived in the Forums, the searching capabilities aren't as good as the forums', and there's no specific AAR discussion area (at least not that I could find).
Of course, the other option is to enter the AAR on SoCal's site, then cross link it here for comment. That way, you get searching and commenting with SoCal's formatting. The best of both worlds.
Just my $0.02.
Nat