First a quick comment about e-tools; if you haven't loaded all the recent patches and enhancements, you are missing out. I was VERY tenative to load it after all the negative reviews when it first came out. A friend got it and felt the same way. But after the upgrades (CM has GREAT customer service!) it really is a nicely usable program. I would give it a recommendation, and also an admonishment to those who are commenting without using it recently...
As for DM tools in game; I've been using PCs and PC type computers for 20 years. It has amazed me over the years how people try to jam simple tasks into a computer, when the original method works just fine and is much simpler. It is so much easier to pick up a d20 and roll it than to grab the mouse, point it to a button, change the d20 to "1 die" and then click to make it roll.
Don't get me wrong, I use Word Perfect (I'm an old timer who won't give it up

, excel, access, Camp. Cart., CorelDraw and PSP as well as Buck's generators to CREATE my games, keep track of things, create NPCs, track PCs, create handouts, etc. But I print it all out and put it in a binder for game time. My PC is near for some occasional sound effect or lookup or reprint, but the times I've used laptops behind the screen, they have just made things more complicated.
I've previewed every DM tool I can get my hand on. I have to second and third other posters comments that they just don't quite do what *I* need them to do, in my format and method. And once again, so much of them are trying to jam simple tasks into a program that only serves to make them more complex.
A quick suggestion about hiding die rolls; I have very small, light dice and I roll them into my binder onto the papers. It completely muffles the sound. The players have no idea when I am rolling. But sometimes my 4-year old comes down to "roll daddy's dice". He yells out the number before I can stop him, and the players give him a dime everytime he rolls a one

Of course, there is no fudging with these rolls...