Favourite apps so far:
JeFitPRO - Only lacks the option to add your own exercises and being able to add pictures in it.
SmartVolumeControl+ - I've used many apps but any other had the specs and functionality of this one, my favourite option is to add a profile for every situation which really helps to save some time in daily life. It is amazing what you can do with this app, I can turn on 3G, Wifi, Vibration Mode, even define which volume i want for the people who call me!
3G Watchdog - Helps me controling my 3g data, saving me loads of money in the end of the month.