Is there some theme development docs/howto somewhere?
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http://doc.silverstripe.com/doku.php?id=themes is the current page for themes. for other advice on theme development follow the 4 wicked tutorials Andy has written - http://doc.silverstripe.com/doku.php?id=tutorial:1-building-a-basic-site.
This page is helpful as well - http://doc.silverstripe.com/doku.php?id=built-in-page-controls&s=page%20controls
What howtos to would you like to see for the themes
As mentioned on homepage, with the release of 2.1 the way themes work has improved, so docs will be updated shortly! :)