I use TreePad for notes. It's probably got a lot more functions than I use but I haven't spent any time really learning it.
I use a wiki for my campaign notes. (
dmgaming / FrontPage) Any wiki will do but I found this one and have liked it.
I also use Master Plan for a combat planner and to use for fights. However, I have two remote players so need something to do this so things are clear to them.
I use TightVNC for the remote plays to connect to the computer running masterplan to see the player view.
I use Skype for the calls to the remote players. I have three computers and two web cams running to support this and they have the same on the other end.
I use EBoN (Everchanging Book of Names) for random names. In fact, I just spent the time needed to create specific ones for my Dark Sun campaign.
I also use Tablesmith 5.1 for a good random generator on a lot of topics. I have even created my own tables for certain things or modified existing tables for my own needs, especially Dark Sun.
I am looking at the 4E combat tracker but while it has a lot more ability than Masterplan in terms of tracking combat, but I don't want to use two combat trackers. Also, it can't do a map, which I do use, for combat. (I don't think we need a map but it does help.) However, it's very slick and if I didn't use Masterplan, I could see me using this. (I am hoping he adds the ability to add monsters automatically with a DDI subscription.)
I have used Word, Excel, another home made combat manager that was posted here (more for 3E), and many other tools. If I think of more, I will post them but I think my current toolset is above.
edg