there are two apps i've tried that have worked, z4 root, and visionary (both can be found on xda-developers.com). but right now both apps can only temp root and not perm root. z4 worked well when i first got the phone but after my first reboot, i could not get it to work anymore. with visionary, the steps i took to get it to work were after installing the app, put the phone into airplane mode and close all other apps. open the app and check the "temp root on boot" option. then select the temp root now option. the phone will probably reboot and after this reboot it will be very slow. but be patient, give it some time to load up everything. leave it in airplane mode and then manually reboot again and when the phone starts up again, it should be temp rooted. this is kind of a hassle but at this point, probably the easiest/safest way to gain root access.