I think answers will vary greatly dependent on who you ask, but for publications- a program director told me he looks to see if you're "first author" or "not." The "not" is everything else (second, third author...) because first author=ownership and that's why people fight so hard to get first author status or get so pissed off when they're 2nd author. For presentations, I've been told they hold significantly less weight than a peer reviewed publication because even at the national meetings, it's not that difficult to get a podium presentation, especially since the "review process" is just looking at a few hundred word abstract. Just what I've been told, please don't flame me or start a huge debate