One of the problems with modern programming languages is heavy installation. Last year I tried convincing a friend to learn some modern programming languages with me, and we couldn't get his dev environment to work. He gave up after a couple of days, and I didn't know about the adobe meeting/screen share tool at the time to walk him through setup.
More often than not there's no one click setup. In fact, if you plan on doing any serious work, setup of all required development tools can be quite involved. A recurring question haunts me, why are such great tools hidden behind walls of detailed installation? As a sample point here's a list of some of the development tools I installed over the past few months (at home and at work):
Java Virtual Machine, Java SDK, Ruby MRI 1.8.6-1.9.1, enough gems to be rich 10X over- many which required compilation, JRuby, Rubinius, Duby, Python, Perl, Google App Engine SDK (Python+Java), MongoDB (we moved to sqlite3), Aptana Studio & Aptana Radrails, Eclipse Galaxy + Pluggins, Netbeans + Pluggins, git, Tortoise Git, DiffMerge, Wine, VirtualBox, VMware, and a few browsers with Firebug - Firefox, Chrome, Chromium (work security dissallows Chrome due to some 2008 vulnerability, but allows GPL so Chromium's kosher - long story).
I'm sure there's plenty more that I'm forgetting at the moment. Not all of these tools install smoothly, although most install much faster and with less complaints on Linux (versus Windows). Of course I don't use all these tools every day, but when a need arises I install the tool. In doing so I die the death of a thousand paper cuts. When I choose to setup a new development environment or change language interpreters it can take significant time to shake out all the conflicts. In fact the time cost is large enough that I tend to use inferior utilities in lieu of system wide upgrade time. My favorite feautures are ease of reading, highly functional core installations (rich default lib), and always available.
Solutions & Ideas
I have visited a number of sites that have input windows which allow code entry and perform interpretation and execution. But the input source and run time is limited, there's no way to control installed resources, and the output format is highly constrained. Regardless these interfaces are fantastic for learning, and are part of the inspiration for this programming idea.
A Web & Browser Based Language
^ CoffeeScript looks somewhat Python or Ruby like
Red 4.0 is a full implementation of Ruby in the browser. I have to check it out asap.
Here's Uki on github.