Hello i'm from Vienna and i will get my n900 device tomorrow.

I'm Not a Linux User (Mac ) but i hope i'll Get along with this great Smartphone/Minicomputer

Are there any hints for a New User?

Which Apps are a Must
Which Tweaks / Hacks are Necassary?

Or is it better to explore the N900 a few days before Tweak it (battery, speed, cssu) an live with the Out of Box Features?