I don't think that a multiple language approach is viable for production applications in my professional situation. These other languages may have a place for implementing better test coverage and operations/support tasks.At a minimum, they are super-interesting and I would be remiss if I did not give them the attention they deserve!
There is not (apparently) an official url to download a particular release. The first link in the introduction section has a link to a page local attachment. The scriptom module is located in svn.
You need a way to quickly prototype solutions in VB or C that you will subsequently port to Java. In particular, you need to be able to find the actual values for defined constants like windows message IDs. Download and install the express editions of Visual Basic and Visual C++. There is an ISO containing all Visual Studio components that may be useful to go ahead and download.
Decide on utility to call into native functions. Currently know of two options
Getting win api accessibility in groovy
Integrate utility into scriptom for win api access while maintaining jacob for com access.
Add functionality to call win api functions to jacob and subsequently into scriptom.
Update scriptom to replace use of jacob with jawin.
Add a completely separate groovy module to support win api calls using the utility
Visual Basic Programming Books
Sams Teach Yourself Visual Basic 2008 in 24 Hours (James Foxall)
http://en.wikibooks.org/wiki/Programming:Visual_Basic_Classic
http://www.vb6.us/
http://msdn.microsoft.com/en-us/library/aa383749.aspx
API Guide and API Viewer