The blog and home page of Simon Soanes
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This has been delaying my release of an upgraded version of this blog for months now, and has also meant that I have chosen to use Linq To SQL on several large projects when working (Linq To SQL fully supports this scenario despite being the 2nd class citizen in entity mapping at Microsoft), Paul Patterson explains it quite well here so I can be lazy and just link to his article:-

I wasn't willing to employ his fix though, it was frustrating and would get overwritten whenever the schema was updated however I have just found that there is a hotfix for this now available from Microsoft so that you can correctly configure the EDMX in entity framework to support the rowguid correctly:-

This isn't perfect as you still need to manually set the StoreGeneratedPattern option on the rowguid columns to Identity, but it is certainly better than the total failure that was the case before!  Hopefully they will consider better support for replication, guid's and server-generated values in future versions.

I guess this means I can finally switch to Entity Framework and get my new site version released... :)