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I've posted asking what hands you should call with in this situation, but didn't get any responses.
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There were many discussions here about this matter. Try searching some of eastbay's posts, for instance.
Regarding the HU situation discussed:
Well, if it's a long enoug HU game, and the blinds are still low and you have time, all you have to do is to wait for a nice hand and let him put you all-in. If he's pushing almost every hand, a hand like 88 is a monster. Take a look at this table:
HU Holdem
If the blinds are relatively high, any advantage you could have is significantly reduced, and he's playing in a rather efficient (not ideal) strategy, especially if you're on the tight side.