The SharePoint Online Standard Developer Guide is now available for download here.
Some of the main topics covered (and tested) include:
· Customization capabilities and limitations.
· Custom templates, master pages, style sheets.
· Data Form Web Parts (adding, editing, deleting, sorting, filtering list items).
· The 20 site admin templates of the fantastic forty (the other 20 are of type server admin templates and require custom code) are tested and they work with SharePoint Online.
· List of supported and unsupported SharePoint Online web services.
· Integrating Microsoft Silverlight with SharePoint Online.
· No-code Workflows using SharePoint Designer.
· Code examples and scenarios as appropriate.
Also, an update to the SharePoint Online Standard Service Description is now available here. This update includes a matrix comparison of SharePoint Server 2007, SharePoint Online Standard and Dedicated offerings.