I have completed Chamber 18 of my OoB Speedrun. Check it out:
Portal - OoB Speedrun - Ch. 18: http://www.youtube.com/watch?v=V-VHTb-pgyE
I’ve calculated that if I am able to shave off 1 min and 9 secs from my original non-oob speedrun in the next 4 maps (ch19, esc00, esc01, esc02), I will be beating the game in under 10 minutes (which was a goal of mine for this speedrun). I am positive I will be doing this with all the OoB routes for the escape levels. I may be able to achieve under 9 minutes now.
Edit: I actually calculated it wrong. It is 1min and 50secs I have to shave off. I think I’ll probably be above 9 minutes then. :-/