Adaptec is shipping a number of products in an GPL in-compliant way. We've already enforced the first infringing product that I learned about, the Adaptec iSA1500, an iSCSI storage array.
Instead of showing the community their support and at least providing the full corresponding source code on their download page, they now require you to send a written letter to their legal department to a US postal address in order to get the source code for a specific product.
This really looks like they're trying to make it as hard as possible for anyone to get the sources, while still staying withing the boundaries of the GPL.
I don't really know what they gain by that.