Here are the resources referenced in my SharePoint Saturday Perth presentation on Customising SharePoint Online:
SharePoint Online Restrictions:
http://msdn.microsoft.com/en-us/library/gg615454.aspx
Sandbox Logging:
http://spsl.codeplex.com
Client Object Model Authentication:
Free 30-day trial Office 365 tenancy:
Office 365 Service Descriptions:
Office 365 Developer Training Course :
SharePoint Online Developer Resource Centre :
Thanks to Brian and all the SharePoint Saturday Perth sponsors, presenters and attendees!