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Microsoft has released an Virtual PC Image with Dynamics NAV 5.0 SP1 together Mobiles Sales integration. You can make download from partnersource directly from https://mbs.microsoft.com/partnersource/downloads/releases/dynamicsmobile_1_1_pre_vpc_nav.htm?printpage=false
This can be an excellent way of trying NAV 5.0 SP1 since it wasn't released. This download won't be available in download section since it has 5G.
I have upload the how to document in http://dynamicsuser.net/files/folders/documentation/entry108755.aspx so have an overview of demo capabilities.