John W. Kennedy wrote:

> Is there a well-known, supported Ruby equivalent to Perl's 
> HTML::TreeBuilder?
> 

Yes - you can use ruby htmltools:
http://bike-nomad.com/ruby/

You can use these to get a REXML parse tree from ordinary HTML. You can 
then use XPATH expressions on the resultant tree.

Have used this for a few projects and had no problems.

cheers
alex