As I said in my apocalypse/guns thread, a lot depends on how extensive you guess the apocalypse to be. If it's temporary, then defense and scrounging play the primary roles. If it's more or less permanent, then you have to consider what to do when things settle somewhat.
A permanent situation, in my loose definition, means a regression of sorts to an earlier era in civilization. Since here's so much hardware around, smelting wouldn't have to be immediately re-invented, so maybe the new era would look like a couple centuries ago. Agriculture would be the key to survival, with animal husbandry a very close second. Support skills to support agriculture, e.g. blacksmithing, gun-making/repair and doctoring (as opposed to medicine) would be tradable skills in lieu of raising crops.
One additional comment on an above post, I don't think you can presume the capability of freezing seeds to preserve them. In my thoughts on the level of technology post-apocalypse, I don't see electricity as being generally available.
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