Method#args has a home now at http://method-args.rubyforge.org/
I released a new version too. It can be installed directly from the command line

% sudo gem install method_args

There are several new methods for more refined sorcery:

% irb -r rubygems

>> require 'method_args'
>> class X; def foo(hello, world = 2, *blah); end; end
>> method = X.new.method :foo
=> #<Method: X#foo>
>> method.required_args
=> [:hello]
>> method.optional_args
=> [:world]
>> method.splat_arg
=> :blah
>> method.args
=> [:hello, :world, :blah]


ry