1. Layoffs where an entire industry is downsizing, and not everyone who was laid off will be able to find jobs in the same industry. I have immense sympathy for these folks - in many cases it is difficult if not impossible to get back to the same salary level.

2. Layoffs where one company couldn't make it, but the industry as a whole is extremely dynamic and growing by leaps and bounds. This is Yahoo's case. While it's always hard when "somebody moves your cheese", it shouldn't really be hard for those laid off to find new jobs. Plus, the writing was clearly on the wall for a long time, so it shouldn't be totally unexpected. As someone who has been in a similar situation, if anything I saw many people looking to be laid off because they would rather have a sizable severance than go down on a sinking ship.