Here are three videos about the DSO Nano V1 which I wish I’d had a week ago (when I first got mine!)
http://www.heyjameshowdoi.com/2011/06/using-the-dso-nano-pocket-storage-oscilloscope/
Please note that he is using DFU v3.0.0, which does not work with Windows-7 nor 64-bit operating systems. You need v3.0.1 for those situations.
You can also find 16 more Nano videos at youtube.com/user/lwgraves?feature=mhee#p/u, near the bottom of the list.