[anonymouse123]

Maybe not 'lightweight', but I'll throw it out there: how about the MS Express editions (all free)?

http://www.microsoft.com/visualstudio/eng/products/visual-st...

More details here: http://msdn.microsoft.com/en-us/beginner/bb308754.aspx and http://msdn.microsoft.com/en-us/beginner/default.aspx

[snewman]

That's a possibility, but can you use it to build programs that can be posted on a web page? I really wish there was something that felt like writing C# in Visual Studio Express, but produced JavaScript apps.

(He has a Mac, so we'd more likely wind up with Eclipse... not as polished, but similar idea.)

[michaelmior]

How about Aptana Studio? http://www.aptana.com/

[snewman]

Thanks -- I'll check it out.