mobile help needed

I am using the Nokia 5800 Express Music model mobile. I recently bought the mobile in Ebay.com in locked condition and unlocked at http://www.theunlockarena.com/ now my query is where can i get the Best Applications…?
What is the Best Application software…?
Please anyone help me…

How is this question Linux based?

Nokia 5800 Express Music - Operating System: Symbian OS v9.4

So I guess you’re looking at the Ovi Store