These are the basics I'd start off with. Pretty much covers web surfing to live radio/tv to sports performance to live traffic maps - basics of what most people use and need.
Aside from these, you can surf Ovi based on what you're interested in.
dailymobile.se has custom firmwares (cfw) for the nuron, search rm-593 in their forums.
RedX has the latest & greatest. You'll get out of it an extremely fast Nuron.