You can launch it without installation (just unzip the archive). I think there were daily builds of Chrome as well, but I can't recall the link.
It actually just downloads and unpacks the latest version and keeps a backup of the previous release, but I found it quite handy. Be sure to adjust the path, though, if you want to use it.
DOWNLOAD_URL = "http://commondatastorage.googleapis.com/chromium-browser-con...
ssshhhh... don't tell anyone i'm 32-bit