Where can I find a legal copy of the ISO SQL 2008 standard?
The official and final texts are only available by purchase.
The drafts, otoh, are often no more than a google search away. Google for SQL200n.zip and you should get pretty close.
The ISO SQL 2008 Standard document ISO/IEC 9075-1:2008 Information technology -- Database languages -- SQL -- Part 1: Framework (SQL/Framework) is now freely available from the ISO website.