pretty.cs

var methodGroups = (from kvp in Members where kvp.Key.Type == MemberIdentifier.MemberType.Method
                    let m = (MethodInfo)kvp.Value
                    group m by new {
                        m.Member.Name,
                        m.Member.GenericParameters.Count,
                        m.IsStatic
                    } into mg
                    where mg.Count() > 1
                    select mg).ToArray();

raw.cs

var methodGroups = 
  Members.Where(
    kvp => kvp.Key.Type == MemberIdentifier.MemberType.Method
  ).Select(
    kvp => new { 
      kvp = kvp, m = (MethodInfo)kvp.Value 
    }
  )).GroupBy(
    element => new {
			element.m.Member.Name,
			element.m.Member.GenericParameters.Count,
			element.m.IsStatic
		}, 
    element => element.m
  ).Where(
    mg => mg.Count<MethodInfo>() > 1
  ).ToArray();