The author of this post thinks Career Planning is Time Wasted. I agree with the research cited, and the argument is well articulated -- people are notoriously bad at predicting what will make them unhappy -- but I'm not so sure that it translates into all planning being a waste of time. When you're choosing to pursue something instead of something else, you're doing a type of planning, and you might as well choose a general direction (maybe a field, or area of interest, or type of activity) that suits what you're currently enjoying or curious about -- for me, that's all planning is.
There seems to be this idea that career planning for high school students is about picking the exact job description you'll be employed in six or eight years down the road...and if that's the case, I'd have to agree with this assessment that it's a waste of time. It's not about the end goal; it's about process: finding meaningful tasks, developing skills, and building connections in an area of interest that will likely become sustainable work if you really care about it.
This is probably too critical -- I hadn't seen this excellent blog before and probably shouldn't take issue with a single post when there were so many other good ones...oh, well.