I'd like to second the recommendation for Dave Crenshaw's courses. I never realized before that I wasn't actually managing my time; I was just desperately chasing the non-existent end of my entire life's to-do lists. I'm still working on getting through my initial in-box (the one you create by going through his trigger lists), but all the important stuff got done, and I have confidence that the things I haven't gotten to yet aren't important enough for me to panic about (otherwise I would have done them!).

The "time management tips" one is a kind agglomeration of his advice on managing your time, your relationships, your reports, etc., and is a good follow-up. He has a course on having productive meetings, as well, which is well worth the time. It may make you hate meetings at your work, though XD.

Honestly his courses provided a lot of relief and validation to me, as well as hope for a future working in companies. I can't recommend them enough.