Here is my favorite list
Sketchbook Express - very powerful sketch app (I do understand Sketchbook Pro offers more but some other paid apps doesn't seem offer comparable free features).
Adobe Ideas - my 2nd favorite, quite good
Simplenote/Plain text/Notekata - there are many paid text editors!
Team Viewer HD - why someone needs paid Logme in?
Terra web, atomic lite - why someone needs a paid browser (when you get Safari too for free)?
Springpad - works fine offline. But Evernote works only for premium customers!
Gotasks, wunderlist, Neatlist, Jotlist - works beautifully. Why one needs to pay for a todo list?? (Springpad and free outliners can also offer todo list) GoTasks/Jotlist offer nested lists as well. Jot list can even do a summation of amounts!
Idea Sketch - so cool for flowcharts.
Sundry notes - text, sketch/draw, record audio, multiple pages etc. Quite good for note taking
Flipboard, Zite, Pulse etc. - wonderful news/magazines. What paid ones do better?
Tune in radio - yes, they have a paid version too but free one is wonderful
I'm leaving games altogether because that's completely different segment.