Are you going to complete Portal, then start mapping? Cache the game then start mapping? Or something completely different.
Views and stuff.
Kthx. 
Views and stuff.
Kthx. 
Gamespots review on the Orange Box discusses that in their Portal segment of the review.
About the main topic, I would play first Portal when it's out, then Episode Two, and then I would immediatly start to map on Portal on a secret project I have in mind.
msleeper wrote:
- That, or we'll just have to put trigger_hurts at the bottom of our traps.
Or we can just slap a few explosives and turrets with some info_Targets ontrigger. 