At the moment, I set these resource folders:
/res
/drawable
/drawable-large-hdpi
/layout
/layout-port
/layout-large-hdpi
large-hdpi
folders are for Galaxy Tab, while others are for other tablets.
What additional resource folders do you suggest to add?
We use large-land, large-port, xlarge-land, & xlarge-port, but I would not recommend this.
I would recommend filtering drawables based on pixel density & filtering layouts based on screen size. Also, read THIS.