When you’re starting development for WordPress it can be very handy when you’ve got the latest WordPress version installed. How about if you’ve already have a WordPress blog and want to upgrade this WordPress blog to the latest possible version in the WordPress trunk (and the latest nightly build). There’s a nifty little WordPress which should do the trick really easily: WordPress Beta Tester.
After installing the WordPress Beta Tester plugin go to the settings page of the Plugin to define whether you’d like to download the “Point release nightlies” during update or the “Bleeding edge nightlies”.
The Point release nightlies are the updates which should be relative stable.
By selecting “the Bleeding edge nightlies” whenever you’ll update your WordPress, you’ll update to the Trunk version of WordPress (You are getting the absolutely latest version). This procedure obviously could harm your site, but in 99% of the cases it won’t.
Nevertheless it’s recommended to have a Backup of your latest data each time you update to one of these versions.
Updating a live-website to a non-stable release of WordPress is not recommended for not-experienced users! You should **NOT** do this on your live-site if you don’t know what you’re doing!
If you want to have the latest version of WordPress for development or testings purposes this is a really cool plugin.