There have been some posts on this subject scattered in other Touchpad thread, but it’s difficult to keep track of the success or otherwise with the different options. Some possibilities are:

The official HP Touchpad case.
http://www.hp.com/united-states/webos/us/en/tablet/touchpad-accessories.html
http://www.shopping.hp.com/store/product/product_detail/FB343AA%2523AC3
Some people have mentioned that the cover flap does not have magnets like in the iPad design, so might not reliably stay closed for protection.
The Incipio case… some feedback from the other thread suggests these were originally designed for the iPad and are a poor match for the Touchpad.
The Poetic Slimbook PU Leather case. There are some feedback comments on Amazon that PU Leather means it isn’t real Leather and the quality isn’t as good as hoped for.
http://www.amazon.com/Poetic-Slimbook-Quality-TouchPad-Touchscreen/dp/B005H476S8
Do Poetic offer more than one Touchpad case? Or is it the same case that I see sold under different names as I also see this Poetic HP Touchpad Stand case.
http://www.amazon.com/Poetic-TouchPad-Adjustable-Compatible-Touchstone/dp/B005J064XS
The Targus Truss case is another option – perhaps better protection than most of the other options, at the expense of a little more weight.
http://forums.precentral.net/hp-touchpad-accessories/291420-hp-touchpad-case.html
http://forums.precentral.net/hp-touchpad-accessories/296547-hp-touchpad-case-vs-targus-truss-case-review-pics-inside.html

I don’t have the Touchstone charger, which I believe is an compatibility issue for some of these cases.
I’m sure there are other options. What did people get, where did they get it and what do people recommend?

I'm also considering screen protectors, but I'm wondering if these are really needed?