Cool Looking Apps like Groups

I was perusing an article about iPhone apps with nice interfaces again today, and decided to download one of them. After all, I’m a sucker for a nice GUI, and I bought Convert just for the purpose of checking out its GUI.

But the app I’m talking about this time is Groups. I just moved my Contacts app to my page of rarely used apps, and replaced it with Groups. Yup, it’s that good. It has a gorgeous GUI, and is very functional to boot. One of my favourite features is being able to email a whole group of people at the same time. I’ve included a screenshot from their website to the right. I don’t think they’ll mind.

Yeah, so my point is that this app looks nice, but it also works nice. Apps like this (and ConvertBot and Convert) make me think that I need to brush up on my user experience skills a bit.

Does anyone know of resources about how to design a good iPhone user experience? What about links to articles like the one I linked to at the top, which just shows off some nice iPhone apps?