Safe place for ACPT spoilers

I know those of you who are doing the Play by Mail option probably haven't seen the ACPT puzzles yet, so blog posts will remain free of spoilers for those puzzles for the time being. (If you're looking to avoid seeing any spoilers, don't read Eric Berlin's excellent write-up.) However, the HaloScan comments window is easy to avoid—if you don't want to read any spoilers, don't click on the comments link. I'll start it off.