obviously, know how to strafe :j
use thrown weapons (not guns) to smack totems and interrupt bandages
google "Shadowstep focus macro", learn to use it to shadowstep + focus kick healers.
if you know somebody (particularly a mage) saw you stealthing, try not to run in straight lines, you have no idea how many times i've been able to anticipate where a rogue would be, because i saw him stealth as he came out of the corner.
when stalking an efc that you cannot solo, try not to "hang about", SO many rogues just sit around and wait for help, right beside the defenders, however it increases your chances of getting busted by like 700%..
chug plenty of thistle tea, its priceless..