i think most of the apps I've downloaded already have been mentionen, however I still have a few recommendations:

Fitness builder (waiting for Sports tracker to go Hamattan!)
HTML5 trends (html 5 apps, however not udpated daily)
Speedtest
Nokia beta labs (don't think they got anything for N9... yet ...)
GSMArena
some local newspaper apps (for danskere; TV2 vejret kan anbefales, mange af de andre er blot rss-feeds )