You can still either submit a written submission or an independent third party test (IELTS). If you submit a written submission which should normally only be done if you are a native English or French speaker you can now only submit this once. If you do not meet the language requirements the first time then normally your application will be refused. Therefore, if you are not a native speaker it would be best advised for you to do an independent third party test.
There will also be changes to the Canadian occupation list from 1 May 2010. It is expected that some occupations will be taken off the list. If you meet the requirements for Canadian immigration it may be advisable to apply now before the changes to the Canadian occupation list.