Doesn't work on HTC Legend with ROM 2.03.405.3
(original version, non-rooted)
Followed the steps exactly and I get this:
su: permission denied
Update: Tried for the third time and now it worked! So, ignore the above. Now I got:
You have to disconnect and reconnect adb before trying the su command, this is what I did now and worked.
Also installed some apps that need root access (ie. Market Enabler, screenshot apps, Wireless tether) and they work fine.