Block commenting in Ruby

Does Ruby have block comments?

If not, is there an efficient way of inserting # in front of a block of highlighted code in TextMate?

You can do

=begin
  [Multi line comment]
=end

=begin and =end must be at the beginning of the line (not indented at all).

Source

Also, in TextMate you can press Command + / to toggle regular comments on a highlighted block of code.

Source

Ruby has documentation comments - they look like this:

=begin
...
=end

Not perfect but they get the job done in a pinch.

[Edit] It is important to note that =begin and =end must be at the beginning of their respective lines.