--format rerun would be helpful, as it enables automatically re-running failing tests. However that is broken (but they're working on it) in Cucumber 0.5.1 as of Dec 21 2009.
--format junit would also be useful: it produces an XML report format like JUnit's. That report can be consumed by CruiseControl and numerous other tools. But that format also appears (I only checked on 1 machine so far) broken as of 12/22/2009.
In order of usefulness.
cucumber --format usage --dry-run
cucumber --format tag_cloud
cucumber --format usage
cucumber --format debug
Note that usage performs profiling when invoked without --dry-run.
Most deps are installed automatically. But some must be manually installed:
gem install prawn
Prawn is needed for PDF output.