Apparently risearch got folded into ruby-doc.org! How cool is that? Check it out: http://www.ruby-doc.org/risearch/rand. I just made a shortcut in safari (using Stand but you can also use sogudi) so I can type "ri rand" in my url bar and go right to it.
Also note, if you have ruby 1.8 from CVS or the 1.8.5 preview then you also have ri/rubygems integration. This means that looking up rails doco is much more focused and you can now search the rails doco for goodies!
That ruby-doc link is totally whacked in IE. It almost looks like it's generating html infinitely or something. The text keeps getting larger and larger as you scroll down.
So stop using IE. Otherwise, talk to James, not me. :P