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The B149.1-05 with B149.1S1/1U1-07 is still the code to use in Ontario.  I'm not sure what's new in the B149.1-10 code, but it hasn't been adopted by TSSA.

QuoteJanuary 1, 2006 Ontario Adopts the 2005 CSA B149 Series of Codes.

The National Standard of Canada CSA-B149.1-05, entitled "NATURAL GAS AND PROPANE INSTALLATION CODE" with Ontario Amendments

The National Standard of Canada CSA-B149.2-05, entitled "PROPANE STORAGE AND HANDLING CODE" with Ontario Amendments

The National Standard of Canada CSA-B149.5-05, entitled "INSTALLATION CODE FOR PROPANE FUEL SYSTEMS AND TANKS ON HIGHWAYVEHICLES" with Ontario Amendments

TSSA Field Approval Code

When adopting codes, TSSA must engage industry in a consultation process that takes approximately 6 months.  This results in Ontario Amendments to the national codes.  Normally, these amendments are made to reflect practical implementation issues and are based on equivalent safety.  Amendments are then submitted to the national code committee for consideration at the national level.

UPDATE 10/09/2012 - See this post - Here

Where would I find the B149.1S1/1U1-07 on the CSA site?  My search yielded 0 results, and when I clicked on the Ontario Fuel Installer's Package I also got 0 results.

Visit the B149.1-05 Documents Section - Here

If you work in Ontario, you should download all of the files in that section.

The B149.1S1-07 Amendment is attached below.