On: Nexus 7 review: The best $200 tablet you can buy

[roc]

Short version? Instapaper, PDF and CBR/CBZ. There tend to be workarounds for some of these depending on the eInk tablet, but none do all three well.

(Frankly, none that I've seen do any of them well. It's more a question of whether they do them acceptably-enough to bother.)