One of my friends server is having a major griefing/hacking problem on his server and i need to update now to help out. I've been blowing it off for some weeks but the griefers are getting worse. So i regret to say that in till we update to the 1.6 or to 1.5.2 i wont be on in till then

you can use "multi mc" to go back and forth on the version.  ask vbelac he helped Miss Ruby with this same issue.