Comment A Couple of Things (Score 2, Informative) 366
Look at the Getting Things Done (GTD) methodology by David Allen. It's good at helping you keep track of all the stuff that's going on.
Also, when I feel like my head is getting too cluttered, I do a brain dump into MindJet's MindManager software. It can help capture many disparate pieces of information visually and the process can yield some mental clarity . . .