Originally Posted by AllDroid

(Run means type the command in quotes [but not the quotes] then press the Enter key)

Download the attached archive and expand it to a folder you can find (eg. c:\DroidXRoot_v2)
Set up ADB (Step-by-step guide for Windows Vista/7 HERE. <-- USE THAT THREAD FOR ADB SUPPORT PLEASE.)
On the phone: Home, Menu Button, Settings, Applications, Development: Make sure the "USB debugging" option is enabled/checked.
Status bar, USB connection: Make sure "PC Mode" is selected.
Open a command prompt (Windows: Start, Run, "cmd", OK; Linux: Terminal)
Run "adb devices". If you don't see your device listed under "List of devices attached", return to step 2 and follow the link to setup ADB (use that topic for support) and return here when "adb devices" lists your X.
Run "CD c:\DroidXRoot" (or where ever you expanded the archive)
Run "adb push Superuser.apk /sdcard/Superuser.apk"
Run "adb push su /sdcard/su"
Run "adb push busybox /sdcard/busybox"
Run "adb push exploid /sqlite_stmt_journals/exploid"
Run "adb shell"
Run "cd sqlite_stmt_journals"
Run "chmod 755 exploid"
On your phone, navigate to a screen where you can switch wifi/bluetooth on/off easily (settings, or a home screen with a widget)
IMMEDIATELY after executing the next step, toggle wifi or bluetooth off and back on
Run "./exploid" and follow directions on screen. Once this completes you'll be back at a shell prompt.
Run "rootshell". You'll be prompted for a password.
Type in password "secretlol" and press Enter then you are root! (You'll know because your prompt will now be a "#" instead of "$")
Run "cp /sdcard/Superuser.apk /system/app/Superuser.apk"
Run "cp /sdcard/su /system/bin/su"
Run "cp /sdcard/busybox /system/bin/busybox"
Run "chmod 4755 /system/bin/su"
Run "chmod 4755 /system/bin/busybox"
Run "rm /system/bin/rootshell"
Run "exit" to drop from root to a non-root user shell (on phone still)
Run "exit" to drop back to your machine command prompt (instead of phone)

To Confirm root is established:

Run "adb shell"
Run "su" (now you should see the # sign which indicates you are root)
Watch your screen so you can allow Superuser root access.