Here are some cucumber steps that I find insanely useful.
Documentation below is not complete, also it's probably better if you just check out the steps.
When I select "foo" from "bar"
And I select "bar" from "baz"
turns into
When I select the following:
| foo | bar |
| bar | baz |
Wrapper step courtesy of Tim Pope. Scopes the step to a table row or an element with the specified header.
Drops you into an irb-style prompt where you can enter steps or ruby code. Works best for writing tests to cover an existing site with Selenium.