T-Mobile MyTouch Slide has already been rooted thanks to a forum member at AndroidSpin. You can Root the MyTouch Slide by following the clear instructions given by forum member Eugene.
Eugene provides users with a download using which you can root the MyTouch Slide and install apps and improve performance of the device and also allow for tethering of your Internet connection, these are just some of the benefits you can get by rooting your Android device.
Ready to root the MyTouch Slide? Head over to this post from Eugene where he lists out 16 easy steps to root the MyTouch Slide. Make sure to backup your device before you do anything lest something goes wrong.