I am running 3.1.3 on my iPod touch and did the spirit jailbreak when had first come out.

When the new jailbreakme jailbreak came out I had been advised not to do it so I've left it alone.

I'm wondering if it's ok now to upgrade my 3.1.3 and my iTunes and do the jailbreakme. I don't want to lose the jailbroken apps I have.

what would I need to do?