Boros Charm - A fairly recent addition, this card's appeal resides with its versatility.
Champion of the Parish - This is an especially great card to play on turn one; from there, every creature that you'd conceivably play in the deck will succor him upon entering the 'field.
Dearly Departed - If it proves possible to discard this card with Faithless Looting, Tormenting Voice or the Geier Reach Sanitarium, all subsequently played humans will be stronger for it. I've found that it's a much more effective bonus than a lot of the white enchantments out there because 1) it hits all the creatures in the deck except for itself and 2) most decks seem to have a harder time dealing with it than with enchantments. Mardu Woe-Reaper and Scavenging Ooze are the only mainboard cards I've ever had trouble with in the latter regard.
Faithless Looting - This is the prime way to discard the Dearly Departed, but beyond that it also serves to cycle through unwanted cards - mostly lands. This deck rarely needs more than three or four of the latter, depending on what's getting drawn, so discarding the excess is a great way to hunt for more plays.
Gather the Townsfolk - Even without Fateful Hour, this would be a great card. It can grow the Champion of the Parish and Thalia's Lieutenant faster than any other single card in the deck except Thalia's Lieutenant itself, and if there are one or more copies of the Dearly Departed in the graveyard, this card provides twice as much advantage, since it puts two affected bodies into play.
Geier Reach Sanitarium - This is a discard outlet of last resort.
Hanweir Garrison - This card lies at the crux of both counter- and token generation.
Kessig Malcontents - For a long time I was skeptical of this card, and either didn't use it or employed no more than two copies. Having over an extended period analyzed the performance of a variety of different drafts of this deck, however, I have found it quite helpful, and it has since become an integral part of many of the deck's possible turn four victory combinations.
Lightning Bolt, Lightning Helix & Path to Exile - These cards comprise the removal suite.
Merchant of the Vale - I'm still waiting for WOTC to give humans a decent discard valve (and I'm not at all bitter that zombies got Cryptbreaker in EMN and humans got Thraben Standard Bearer). In the meantime, I prefer this fellow to the standard bearer.
Thalia's Lieutenant - This is arguably the cornerstone of the deck. Rarely is this not a card I want to draw (except sometimes right at the beginning of the game, if I have no other humans available to precede it).
Tormenting Voice - This isn't nearly as good as Faithless Looting in my opinion, but I've found that the deck runs better when I have five sorceries to discard with rather than four, and this was the best card I could find to fill that fifth slot with.