iPhone goodies suggestions please!

My shiny shiny shiny new iPhone has just been delivered! It's yet to be charged up and activated with my new phone company, but already I am scouting for STUFF.

So - if you know of any good apps, sites for iPhone3G skins or anything that wil assist the ongoing shininess of my new toy I mean absolutely necessary new piece of technology, let me know.

I've already got my eye on a useless app - the Koi fish pond.