I have had my Sammy for about a month now (its great!). I have been reading this forum quite a bit and i thought i would post what i have found for taking iSammy with me. i tried a few different bags and cases and settled on this one that i found here
I have a Case Logic sleeve that i put the sammy in and that goes in the main compartment in the middle. there is another pocket on the front that i store the ac adapter and wireless mouse. the back of the bag has an organiser section that holds my cell phone and other things.
All in all it works very well for taking Sammy and other things with me.
One thing I have added recently is a project i created. i bought a thin cutting board at bed, bath and beyond that was about the size of the Sammy and i put that in the main compartment of the bag to give a little more protection fro the Sammy. i Glued a mousepad to the surface of the board. as well as providing protection for the sammy it gives me a portable mousing surface as well.
The bag itself is a little pricey at $65 but it is very well made and works perfeclty (for me anyway).