Hi Jim,
I have this idea of implementing vbscript.dll for Google SoC. Any comment would be appreciated before I start working on my proposal.
That sounds ambitious, but you're welcome to try!
For a few years I used to hack VB, and I know the language and VBScript is just a cousin of VB. The runtime library is not big, and writing it shouldn't take too much time either.
If you say so ;-)
I think the hardest part would be to implement the COM interfaces that deal with scripting. And that's the area I know least about.
The recently added jscript stubs are probably a decent place to start. Getting yourself familiar with COM is probably important to the success of your project. I'd recommend a copy of Don Box's Essential Com as the best way to "get" COM in a hurry. There are plenty of online references too, of course.
One general point is that people often don't plan for the amount of time needed to get patches accepted--it's often more than people realize. You might start by trying to get a stub DLL for vbscript accepted, just to get the hang of the development process. Check out the git tree, build it, make some changes, commit to it, and send the patches in. You'll find instructions on how to do all that on the wiki.
Looking forward to seeing your application. Good luck, --Juan