Depends on what you are looking for. For word processing then the ones already mentioned work just fine (I prefer Word myself). I also use a program called WhizFolders (
http://whizfolders.com/) for organizing and cross-referencing story plots, characters, etc. It works well and its cheap.
There are actually a lot of software tools out there, although I've only tried a few myself. (StoryCraft Pro is a stinker LOL). I'd suggest you do a Google search on "writing software". If you're looking for something to dig in deeper to your writing and help you improve, StyleWriter (
http://www.editorsoftware.com/stylewriter/index.html) is a pretty cool plug-in for MS Word that acts like having your own personal editor examinig your writing. They have a demo you can download.
The last one I'll mention is "Dragon Naturally Speaking" for speech recognition. It also plugs into MS Word. The way I use it is I have a handheld digital recorder that I talk into when I'm driving or away from the PC. Then I plug it in to the PC, press play, and Dragon transcribes my notes into Word. Its about 95% accurate, so works well to get the majority of it into text format. Its not cheap though. The software is about $200 and a decent recorder with about 9 hrs worth of record time will run you around $100.
Hope this helps!
