Excellent. I've recently started doing it too, as an exercise in learning arc. I must say I'm really enjoying the language so far.
My only gripe thus far: I do recall finding an interesting documentation page including threading functions, file IO, etc; this does not appear to be linked anywhere useful though. Was this an unofficial site? If it is official, perhaps it should be linked from arclanguage.com.
In any case, excellent language. Well done. Greatly enjoying. A+, would download again.
> It was a lot harder to find than I think it ought to be, but perhaps my google-fu is simply weak.
You're not alone. I lost that page many-a-time before I finally bookmarked it.
Re: your earlier thought, it is technically unofficial documentation. You may find Search Arc Forum [http://af.searchyc.com/] a useful tool for future Arc-related searches. (Although simply searching Google with "site:arclanguage.org <query>" works pretty well.)
I think you're new here... welcome to the forum! :)