But I don't have faith that any of these are true, after reading...
Indentation is important in Stanza programs. Be careful when trying out the examples.
And don't use tabs. Stanza won't let you. We don't like tabs.
Well, good for you. But this aggressive, inflammatory approach to user-friendliness just lost you an entire market of potential users who aren't even going to give the time of day to that attitude. It comes across as petty, and that's not something you want a reputation for. If you have a technical reason for blacklisting \t, put that in the documentation instead.
Also, don't forget that languages where identation changes behavior and is really important are extremely error prone.
Just a quick remark.
Does your language work in interpreted mode? Or can you execute it without precompiling? If your language non interpreted, you should compare the speed and it's advantages to precompiled languages, rather than scripting languages (where most of them are interpreted).
One other issue with new languages is usually the IDE support. Especially with intellisense, and all the fancy tools we get used to when using other programming languages. In my experience, a good IDE is usually the biggest factor for productivity. How is that for stanza?