before anything install this but be careful and read the pdf and wiki before N9QTweak : http://talk.maemo.org/showthread.php?t=80600
install a file manager ( there is bunch in the store )
firefox and opera from store also .
Billboard standby from store also .
Tweetian and qneptunea for twitter .fnobi for facebook . (store also )
wazapp (watsapp from wazapp.im ) and if you tinker also here you will find much more
Enjoy it

Edit : also cutetube from store is a must ( can play videos also ) and kmplayer ( and mplayer ) for video playback .

2nd Edit : homescreen settings from store and FM radio to enable radio .