Garen Thal:
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If you cast Permanency on Protection from Arrows, how long does it last? Does it last forever, or just until discharged?
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Forever.
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If you cast Permanency on Detect Magic, how long does it last? Does it last forever, or until the spellcaster loses Concentration on it?
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I'd use the same guidelines as the Persistent Spell feat: Treat the permanent effect as the "1st round" effect; to gain more information than that, concentration (as outlined by the spell) is required.
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If an NPC has a permanent spell on them, does it count against their gear?
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No. The permanent spell has no intrinsic cost associated with it, although as a DM, you're free to impose one.
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Can you actually Dispel a Permanencied spell? If you do so, is it only suppressed for 1d4 rounds (like a magic item) or is it forever gone?
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Yes, although you aren't dispelling the spell that was made permanent; you're dispelling the permanency spell itself (the normal spell's duration has already expired). Like any permanent spell, the effect is completely dispelled, not merely suppressed.