Which continuous integration software do you use?

Google says there are:

• Jenkins ( first impression: not lightweight )
• Cruise control ( first impression: not lightweight )
• Bitten ( seems to be dead, last ticket >8 months old)
• BuildBot

But BuildBot seems a bit outdated, offering no statistics, not very intuitive to configure... Features we are interested in are:

• Multi platform support for build slaves: Linux, Mac OS X, Windows
• Easy build slave setup
• Mercurial support with branch sensitivity
• Scheduled builds
• Commit-hook builds
• Email notification with full debug output
• Trac integration would be nice but is not a must-have feature

Edit: I favour Jenkins over Hudson by now, since its the real open source fork of Hudson. Oracle just failed.

Hudson is my recommendation. It's easy to setup and use, it's free, there are a large amount of third-party plugins and good community support.