I got a Nexus 7 (32GB) a couple of days ago. A great little toy. I'm currently using Mantano Reader as my epub reader of choice. I'll try out other reader apps when I have time.
I have an OTG USB cable on order from eBay. With that I expect to be able to plug in external drives, mainly to watch movies on USB sticks and micro cards. That will be a good work-around for not having a card slot on the device.
My favourite note taking app (ASUS Supernote) came pre-installed on my ASUS Transformer. It isn't officially available for other devices but I found a copy on the internet and installed that. It works fine, except it doesn't show the bottom row of controls.