My ideal day is:
15 minutes tactics training at chess.emrald.net. I believe it's hard for your brain to absorb much more than that in a day, so too much more is probably wasted effort. Try to move through each problem as quickly as possible.
Pick a master and an opening and go over a few games at chessgames.com. Again, trying to move pretty quickly through each one.
Finding a nice, slow game (at least 30 30, preferably 45 45) on ICC, and going over it and annotating it afterward.
I do those in order, and any day I don't have enough time, I just get as far down the list as I can. If I only have time for one thing, I do the tactics training. Two things, I do tactics then master games.
I spend most of my time playing chess and have developed a decent training schedule. It consists of tactical studies and live games. I have actually found that my game is getting so much better with the right training. Prior to my current course of study, I wasn't making anywhere near the progress I am now. I'm curious what everyone else does regarding training.