In case you missed our presentation on Re-thinking Media Attribution at the recent Google Go Measure event, check out the slide below. 

Thes slides obviously need narration, but the gist of the presentation is that the new Google Analytics multi-channel funnels are an awesome way to measure the full path to purchase as long as you're not a heavy display advertiser (the Google data only contains clicks and not mere impressions) and don't want to track offline responses via search calls to action (needs custom JavaScript otherwise just comes through as organic search traffic). You can track offline sales influenced by online media through email receipts.