I already have a full-sized laptop, so for me, a netbook is just a weaker version of what I'm already using. It would be a bit more portable, but I still need a hand or a backpack to carry it, so it's not significantly better than my laptop.
The Pandora, however, will fit in my pocket, which is extremely convenient.
So it's like this:
Reasons to prefer the EEE:
Larger flash disk
x86 processor can run Windows XP, some games on lower graphics settings.
Bigger screen
Already shipping
Reasons to prefer the Pandora:
Pocket-sized, does not require any extra effort to carry
Longer battery life
Gaming controls
Touchscreen
I dunno about price, but I think the EEE is slightly cheaper than the Pandora.
Mostly, the EEE is larger. I want something super-portable to replace my DS, and the Pandora will do this amazingly.