In Titanium, you can select settings>batch>backup>backup all user apps.
(If you restore all user apps when you get into .605 it is important you do not restore system apps as that will mess up your new system files and give you trouble booting up.)
My personal preference to backing up and restoring apps is to do what's called a "nandroid" or a total rom backup.
You do this through Droid 2 Bootstrapper, which you probably have, if you are rooted. If not, it's available in the market.
You boot into recovery (clockwork mod recovery), select backup and restore. Then select backup to backup your current rom. This will back up EVERTHING. You can fall back on this going forward if you have any mess ups. It's good always have. I update mine regularly.
Get your .605 going (I'll tell you about SBF in a second). Root it and go back into recovery. Then select backup and restore. This time select "advanced restore". This will enable you to restore only your data. Your ENTIRE data, setup and everything. It's really too easy.
As to sbf'ing: SimsDelt put a detailed tutorial up about it
here.
I hope this helps!