Here is a survey, courtesy of Kroll, of the reported decisions around the country in 2007 that dealt with e-discovery issues, along with a "top 5" list of the most notable. Hat tip: Monica Bay.
Bonus: Courtesy of EDD Update blog, here is a summary of a case that addressed the issue of email production that did not include attachments, as well as the difference between the estimate by the requesting party that it would cost $26,000 to produce and the estimate of the producing party that it would cost over $200,000 to produce about 3,000 emails.