WWF Heat is the WWF's B show, on MTV Sunday nights.
In it's current incardination, about three out of four weeks a month, the show features matches taped before that week's WWF Smackdown taping with live commentary from WWF New York, and wrestler dropping by WWF NY to do an interview. It's slightly more storyline oriented than Jakked, as they'll sometime set up things for RAW the next night, but the matches themselves don't usually further anything.
When that Sunday is a PPV, Heat is the hype show for the PPV. Instead of the taped matches and the WWF NY stuff, everything's live from the site of the PPV. The first half of the show is spent going over the card and showing video packages to show what led up to the matches. The last half hour is hosted by the PPV commentators, and typically features a match or two, or perhaps an in-ring interview. Throughout the hour, there are backstage interview with the participants, and a last minute match or two is added to the PPV card.
I started doing this show because no one I liked reading was recapping it. I think I thought about quitting it many many times in the past, when the WWFNY shows would feature the guest in a really silly/stupid story that would progress through the hour to a really lame punchline as the show went off the air. Jakked is passively pointless, but Heat was actively annoying. When less and less people started watching Heat, they took out the running story stuff and stuck with "getting over the character interviews" which aren't as annoying but typically in the pointless category. As such, I don't really mind watching the show - it has the same "you never know what you'll get, but it might be a good match" attraction that Jakked does. Except on the PPV weeks, where it'll be quick and bad ending full, but there's so little of meaning that happens that I can rush through those in record time.
Of course, given the ratings still falling, it may change again and I may be annoyed again. We'll just have to see!