Sorry to hear about your blight attack. We had blight last year. It did-in our tomatoes (several varieites in the G.H.) and potatoes (two varieties - but that was all we planted last year).
In previous years, even though some people in our area had suffered blight, we had not gotten it in
our solanacious plants. Weather-wise, 2012 is so far a lot like 2011 - wet, coolish spring... lots of humidity in the air when it isn't raining.
This year, we took a defensive stance. We researched varieties that have shown resistance to blight. We planted the spuds from clean seed-potato stock, and with tomatoes we started our own plants and made sure the starts were strong. We're growing the tomatoes in the one and only small greenhouse that we have, but we've moved the location of the potato patch (about 30 ft - but within the same general garden area).
And we've treated the seed spuds and the tomato plants and the soil they're growing in with a bacterial fungicide, bought under the trade name Actinovate.
Blight is a subject I'd brought up several times in various posts I've made since I joined SS here, late last November. I mentioned it partly because I wanted to get some dialogue going about organic ways of dealing with it.
We have high hopes for our plants at this point. So far, so good.