1) What good software out there already exists that allows one (preferably visually) see what folders and files are taking the most space on one’s computer (Windows Vista compatible)
2) Say I wanted to write a this program myself, what opensource tools out there can I use to get started?
Thanks!
1) You can try WinDirStat: http://windirstat.info/
2) I don’t think you need open source tools, you could write it in Java or .NET just by using what is already provided with the languages.