That's the word that keeps coming to mind as I watch the '08 Cubs. They just keep coming after it, and don't stop.
I remember watching a number of the As/Angels games the year the halos won the world series (I live in No. Cal, and had a 3 or 4 year old at the time). The Angels that year just kept banging out hits. The Bo Sox two or so years ago were the same way. Every spot in the order is in play, looking to get on base in any way they can. Nearly every inning is stressful for the opposing pitcher.
I don't remember a National League team doing it in ths fashion until our beloved men in blue this year.