1. Users must register/login in order to read the forum. 2. The search engines (Google, Inktomi, MSNSearch) are allowed to access and index the forum (I can disable caching).
What I'm trying to do is allow people to find my forum via the search engines, but force them to register in order to read the forum.
I know how to do it using User Agent strings and IP addresses, but I was wondering if somebody already did something like this. :)