Logos continue to be bad news for those of us with CRT-RP TVs. Not great for plasma sets either. Logos which are very light/translucent are okay.
The worst ones around are the ones Dish puts up on their HD Demo channel when they show the aquariums. If I let those aquariums run for a couple hours a night over a few weeks, I'd have nasty logo burnin.
The Dish on-screen DVR control panel is bad news too. Everytime I pause something for more than a minute or two, I switch my TV to the "Cable" input so it will throw up a "snow" / white noise screen. The snow screen is good not only for avoiding burn-in from the DVR but for wiping any burnout in progress, sort of an eraser. It's good to throw it up for a half-hour every week or so.
I sure wish Dish would have the DVR control panel be more translucent or move around the screen if it paused for more than a minute. I know of a few people who did have burn-in problems from it.