list archive, how to do debug build of X?

Hi all,

I'm new to this list and would like to know where the archive can be found. 
Searches at google always lead me to a 404, think the pages have moved. But 
where to? I'm looking for further information about the nvidia lockups.

Second, I'd like to build a debug release - but could not find any information 
how to do that.

Thanks for your help,
Sebastian