On March 25, 2009, 1050 CHUM became CP24 Radio 1050. I was quick to grab the CHUM Chart for the week I was born because before you knew it the old 1050CHUM.com site was offline.
I remember being pretty ticked about this. I even wrote a plea to CTVglobemedia. If they released the CHUM Charts archive to me, I'd build a site and host them myself. They didn't bite.
I'm not sure who's behind chumtribute.ca, but it claims to be a "tribute to Allan Waters, the Waters family and everyone who worked at 1050 CHUM as a music station from 1957 until it became TSN 1050." Even they've erased the CP24 Radio experiment from the history books.