I hosted a vendor roundtable to a packed house at the PASS 2006 Community Summity.  The topic of the roundtable was "Surviving the Data Avalanche" and was a free form discussion about topics related to the enormous upswing we're seeing throughout the SQL Server community in terms of data growth and retention.

Although the roundtable was non-commercial in nature, I should point out that it was sponsored and hosted by my employer, Quest Software.  However, I believe it has some great ideas and case studies for you if you're facing an environment with lots of data: 

www.quest.com/aftertheavalanche

 Enjoy!

-Kevin