Thanks, that's useful. I totally forgot to include any links even though I was meaning to (and yes, that's my page at the end)

I'm a bit sad to see that it's the only article tagged:

http://hokstad.com/semantic-dictionary-encoding

Did you ever get around to exploring SDE's in a Ruby context?

Unfortunately not yet. My compiler project has stagnated a bit, though I still work on it occasionally (most recently I've now come to the point where I have to implement GC - the compiler racks up 2GB of mostly garbage while trying to compile itself...). I do want to eventually retarget it to SDE, but it's unlikely to happen this year...