One key tool in my toolbox is that I download just about every session for Mix, TechEd, etc. I then put them on my Zune, and listen to them while doing dishes, yard work, walking to the bus, or while on the Stairmaster. I listen to some of them more than once if they are particularly good, and on occasion, some session is so good that I watch it on my computer and make notes.
Download: TechEd 2010 Sessions
Download: Mix 2010 Sessions