Andres has released the code for an implementation of WS-ReliableMessaging via his blog here. I've taken a quick look at the code and it looks good.
There was quite a bit of talk a few months back about how WS-ReliableMessaging should be implemented. The discussion mainly revolved around where the RM Sequence should be created and terminated in the implementation so as fit nicely with the different WSE 2.0 channels. This implementation preserves WSE 2.0 by simply sub classing SoapSender and SoapReceiver and providing a SequenceManager.
Regarding message correlation, Andres's implements a MemoryStorageProvider only, but looking at the code, it would be relatively easy to build the DBStorageProvider which implements IMessageStorageProvider.
Some other nice features include integration with a WSCompression library and a ton of useful Utility classes suitable as good examples for those who are starting out...
Christian Weyer of Plumbwork Orange fame has also indicated that the code might be integrated into the Plumbwork Orange mainline. This would be very interesting and would definitely give Hervey Wilson something to think about (and measure against) for the WSE 3.0 feature list...
Well done to Andres on getting this first implementation (that I have heard of) out there!