> Now I'm developing Ruby/DL2 to replace Ruby/DL with it. It 
> will support 'long long' type and remove restictions on 
> callback function. But I'm not sure when it will be available.

Note that Takaaki is hosting Ruby/DL2 on RubyForge:

http://rubyforge.org/projects/ruby-dl2/

So folks can follow along if they're so inclined...

Yours,

Tom