Patrick Logan wrote:

>Having been away from Ruby for a couple of years, I have a few
>questions...
>
>(1) Where is the "official" definition of Ruby?
>  
>
It seems to be the source.  I think Rubicon is a rather nice definition 
as well, but it's far from being the "official" definition.

>(2) I have seen pages mentioning at least one "Ruby in Ruby"
>implementation. What is the status of this/these?
>  
>
As far as I know, any effort has stalled.  Matju was working on MetaRuby 
and Robert Feldt was working on Ruby VM (to name a couple of potentially 
related projects), but neither is actively maintaining the code.

>(3) I have also seen a mention of a "Ruby in Java". Is there one?
>  
>
http://jruby.sf.net

>(4) Finally, what about a dotNET Ruby? I have not seen a mention of
>this, but it is more difficult to search for given Microsoft's screwy
>choice of terms.
>  
>
I know that work has started, but I have the same problem you do in 
trying to find it now.