of all the apps that i use on my android phones the most (CoPilot aside) is Titanium Backup Full/Pro/Donate whatever you want to call it.
Just make sure you unlock it to get the DropBox feature.
in the Nexus S with the lack of the extra external storage, it's almost a must have to be able to back/restore all your apps & settings online, and on the go, so that if crap happens, you can easily just restore them all back.
it also facilitates a lot when we are constantly trying out new ROMs
with the 1 click restore feature
Just make sure you unlock it to get the DropBox feature.
in the Nexus S with the lack of the extra external storage, it's almost a must have to be able to back/restore all your apps & settings online, and on the go, so that if crap happens, you can easily just restore them all back.
it also facilitates a lot when we are constantly trying out new ROMs
with the 1 click restore feature