Metadata: a slide showing how this list is good to newbies.
Unfortunately, ruby-forum.org not quite up yet (get screen shots of old
phpBB ruby-forum.org ?)

Some other collaterals: the wall chart
http://www.cafepress.com/cp/browse/Ntt-ruby+core_Nao-1_Ntk-All_pv-mathomhouse.4631975_No-1_N-0_D-ruby+core

Ryan Davis' Quick ref:
http://www.zenspider.com/Languages/Ruby/QuickRef.html

Also show how the pickax2 is the best indexed software book ever IMO.