i seen it havent downloaded many apps yet trying to figure out what apps are good
something useful i would recommend specifically for the sgs2 is one called appzorter light. it will sort all the apps in your app drawer into alphabetical order so its easier to find what your looking for. thats one of the most annoying things about this phone but that fixes it.
i would also recommend downloading a music player app if you are going to be listening to music on it. they will give you a bunch more options over the stock one. i use winamp but there is a lot on there. try out a few and see what you like best.