Just received and used the L-plate from John Milich yesterday. As Michael's new review and Ligament's comment suggest, it works great and makes the DP2M much more functional. The camera now weighs 18 oz with L-plate and grip combo. John's email and PayPal ordering process worked fine, and the L-plate took about 4 days to travel from NY to CA, pre-hurricane.
Anyone found an adequate case yet?