Well, it’s finally out.  Gartner completed its analysis and published the 2009 Gartner MQ for Content-Aware DLP.  Congrats to Paul and Eric!
There aren’t too many surprises in here:

RSA, Symantec, and Websense are the only vendors in the leaders quadrant
McAfee (previously Reconnex) and Vericept dropped from the leaders quadrant

The renaming of the report to content-aware DLP is [...]

Rich Mogull of Securosis.com just completed a sponsored report called the Executive Guide to DLP, including a video series (3 clips).  You can check it out here: http://www.websense.com/welcome/MiscLandings/exec_DLP/exec_DLP.html
Description: Reported data breaches increased by nearly 50 percent in 2008 and industry and regulatory requirements are continually being added to stem the tide of data leaks. Data [...]

As Data Loss Prevention (DLP) emerges as one of today’s hottest technologies, it remains among the least understood.
Organizations continue to invest in tools and processes that make information available and portable.  This availability risks leaking confidential data into the public domain and potentially the hands of competitors.  This year alone I’ve met with more than [...]

In case you haven’t seen it, here’s the Gartner Magic Quadrant (MQ) for Data Loss Prevention (DLP), 2008.  This is a great tool to understanding the different vendors in this landscape.  It’ll help you get a bearing to understand what vendors and technologies can best address your needs.  Download the MQ here.

Rich Mogull - of securosis.com - wrote a paper for my company and SANS a while back which is simply outstanding.  I refer to it as the “Bible of DLP” because it is such a terrific piece for anyone trying to understand DLP technology.  Check it out - Understanding and Selecting a DLP Solution.