As previously stated powershell cannot call generic methods of non-generic classes without nasty reflection. So Added these insert overloads to MongoCollection<TDefaultDocument> allows us to insert documents.

Powershell script to test:

1. We assume that the driver is installed via the MSI.
   #[string] $mongoDriverPath = (Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\.NETFramework\v3.5\AssemblyFoldersEx\MongoDB CSharpDriver 0.11").'(default)';
   [string] $mongoDriverPath = "C:\Program Files (x86)\MongoDB\CSharpDriver 1.0\"
   Add-Type -Path "$($mongoDriverPath)\MongoDB.Bson.dll";
   [MongoDB.Bson.BsonDocument] $doc = @{
   "_id"= [MongoDB.Bson.ObjectId]::GenerateNewId();
   "FirstName"= "Justin";
   "LastName"= "Dearing";
   "PhoneNumbers"= [MongoDB.Bson.BsonDocument] @ { 'Home'= '718-641-2098'; 'Mobile'= '646-288-5621'; }

   ;
   };
   #$doc;

Add-Type -Path "$($mongoDriverPath)\MongoDB.Driver.dll";

$db = [MongoDB.Driver.MongoDatabase]::Create('mongodb://localhost/powershell');
[MongoDB.Driver.MongoCollection[MongoDB.Bson.BsonDocument]] $collection = $db['example1'];
$collection.Insert($doc);
$collection.FindOneById($doc['_id']);