Does anyone know if the MySQL .NET Connector 6 can be used w/ the Entity Framework 4 in Visual Studio 2010 Beta 2?
No, EF4 in Beta 2 only supports SQL Server 2005 & 2008 I believe.
More providers are on the way but aren't released yet AFAIK.
Devart dotConnect for MySQL offers support for EF v4 Beta 2.