I have been writing a lot of VBScript lately and I came across this nice editor that I evaluated and then bought a copy for my use. There might be better ones out there, but this one fits my needs pretty well so it might fit yours also. The program is called VBsedit and is available from http://www.vbsedit.com
Features of VBsedit
If you are writing vbscript code and you want a good editor with built-in debugger, you should check this one out.