1) Multi-line lambdas (no equivalent in python afaik):

  collection.map do |i|
    blah = something(i.something)
    blah.something_else
  end

2) Easily chainable object methods instead of weird global functions:

  a.length
  collection.map { |x| x^2 }

vs

  len(a)
  map(lambda x: x^2, collection)

3) Closing braces instead of whitespace make it a lot easier to judge indentation level