The Android 2.1 update for Sony Ericsson X8 users was just released last month. Because it's not the most current operating system, it leaves a great desire to be rooted. However, many users are not familiar with the rooting process.
If you are new to rooting, or just want a simple step-by-step guide, XDA forum member mohakrastogi has put together the guide for you.
The guide is written with the unexperienced in mind. Using simple and detailed steps, along with answering any questions that you might have.
The guide is very detailed so it's best you check it out under the original XDA thread.