Tableau can significantly improve your ability to measure, analyze, and report website and email data.

Calculate ROI and Effectiveness of Email & CRM Marketing
Tableau can be used to analyze data from CRM, email, and automation platforms. Develop stunning and insightful funnel reports. Segment and perform database hygiene. Analyze campaign and lead nurturing stats. Combine multiple data sources into a single view of your closed loop marketing efforts.
In this view, we see how a marketing department uses Tableau to analyze Eloqua and Salesforce response and email data. The first view shows accounts ranked by activity. Individual activities and accounts can be filtered and drilled into. You can even see individuals and the activities they performed on a visual timeline. The second tab show campaign metrics.

Analyze and Hit Your Digital Media Goals
Tableau helps analyze data from ad servers and platforms. You can look at all the data and determine which channels, media, banners, and keywords are performing and driving the most bottom line impact.
The types of statistics you can track in Tableau include impressions, clicks, acquisitions, CPC, CPM, CTR, ECPA (effective cost per acquisition), plus industry averages for comparison.
The biggest thing you'll notice is the time savings. You'll analyze your data much faster and have the ability to inspect campaigns together (instead of one at a time) and compare information across groups, markets and demographics.