assuming the model that you've described to me, I would propose to use something like
var q = from p
where p.Start == DateTime.Now
The LINQ expression given above generates then SQL similiar to
SELECT d.[first_name] AS COL1 FROM [x_project] a JOIN [y_compan
y_x_project] AS b ON (a.[id] = b.[id2]) JOIN [y_company] AS c ON (b.[id] = c.[id
]) JOIN [z_contact] AS d ON (c.[id] = d.[id2]) WHERE a.[strt] = ?
So a list of all FirstNames of all Contacts of all Companies associated with the project started at the given DateTime.Now is returned.
the Telerik team