I found the video below on youtube & downloaded the rooting software from the description (superoneclick). You can ignore the first half of the video as this just talks about flashing to 2.1
Although the video is for the x10 it worked perfectly for the mini also. It shows busybox on the market.... unfortunately this is no longer the case, but is easy to find the .apk file & download it. Then just needed to download busybox & titanium backup to remove all the rubbish on my phone! I managed to triple my internal space by removing unwanted (but protected) apps.
Also found Rootexplorer was well worth the