I just bought a Lumia 900, now what?

I'm migrating from an iPhone 4, and the first thing I thought when I picked up the device was "I love this thing, the big screen, really responsive, entirely new experience". Monday of this week, I took the plunge as my contract was out (I got mine from Carphone Warehouse on O2 as O2 don't supply them yet). After a while though, I found the number of apps to be lacking. It's early days yet, but I still love the device. I've got that feeling that, like with the iPhone 4, I can really rely on it.

I must ask though, what are your apps of choice from the Windows Phone 7 Marketplace, and after having your device for a while now, do you still have the same love for it?