hey zippy, heres a site that might interest u (not sure if uve seen ne of this b4): http://www.strategyinformer.com/pc/mods/portal/mod.html
now that i know bout this stuff im gonna d/l it & connect it 2 portal for more fun!
Portal was awesome. It was so good in fact, that I couldn't resist just blasting through the whole thing in one sitting. It was really cool to see the change in surroundings... Oh wait, shouldn't spoil that bit for anybody who hasn't played it. PLAY IT NOW!!! You won't regret.
portal prelude is waay harder than the original (for me at least), but it is a great piece of work. The guy should really sell in on steam, he would make a good amount of cash