How to Wifi tether – Wireless tether your XPERIA X10 Mini Pro
This was tested on a XPERIA X10 Mini Pro Running Eclair (2.1)
1. Root your phone. (Install the app z4root from the market and do a permanent root)
Here is z4root.1.3.0.apk
2. Install the 'barnacle' app, from the market as well. If you have trouble finding it use the code below (or click to download the apk)
Success stories in the comments 
How to remove preinstalled apps on Xperia X10 Mini Pro
With this tutorial you will be able to remove stock apps that come when you buy your phone(goldrush, wisepilot, creatouch, roadsync) for this you need to root your phone (If you haven’t –follow this simple guide).
Then…
Open the shell by running “adb shell” on your command prompt.
adb shell
Change directory to /system/app
cd /system/app
List the currently installed apps
ls
And to remove an app, run the command
rm –r [appname].apk
The apps I uninstalled were:
rm -r rollercoaster.apk
rm -r peggle.apk
rm -r california-gold-rush.apk
rm -r roadsync.apk
rm -r creatouch-2.apk
And that is it… (Simple, right?)
Make sure to not uninstall system-wide apps such as Timescape or Homescreen, as this may break your android and you might have to reinstall stock firmware and start all over again…)