Originally Posted by Douglas
Not that I have a lot of experience with this, but why so curt? I would at least have words of thanks or something noncommittal but classy. Can't hurt to maintain the bridge just in case.
Basically, you want the letter (something permanent and in writing) to be brief and professional. You shouldn't burn bridges with it, nor should you offer advice or give any reasons or anything else like that. Polite, professional, to the point and nothing more. If you want to say thanks, that is fine. Beyond three sentences and you are probably rambling.
Speaking with your boss is different entirely, and depends on your relationship there. As I actively try to maintain solid relationships with my direct supervisors, I always give them a heads up so they can prepare. It sucks to get left high and dry suddenly. I also make sure to offer to train a replacement if they can find one in time. Smooth transitions help everyone and are always remembered.
But. . . be prepared to get walked right to your car by security the moment HR gets that letter, no matter when it says you are resigning.