jUpgrade: THE way way to go to upgrade..

jUpgrade is a simple Joomla 1.5 component that will download a version of Joomla 1.7, decompress it and install it.

After that, it migrates all of the data from old Joomla 1.5 to the new Joomla 1.7 installation.

I have used this on 4 different sites now and it has worked flawlessly from 1.5.23 up to 1.7!