While looking for key Office 365 resources, I found the following to be useful starting points:

• Getting Started with Office 365 - http://onlinehelp.microsoft.com/en-us/office365-enterprises/default.aspx 
• Office 365 - a Tour for Users - http://onlinehelp.microsoft.com/en-us/office365-enterprises/default.aspx 
• QuickStart Guide for Office 365 Enterprise - http://onlinehelp.microsoft.com/en-us/office365-enterprises/gg570307.aspx 
• Introduction for Office 365 administrators - http://onlinehelp.microsoft.com/en-us/office365-enterprises/gg524291.aspx 
• Office Videos (see “Office Web Apps”) - http://office.microsoft.com/en-ie/office-video-FX102493438.aspx?CTT=97 
• Forum for Office 365 - http://community.office365.com/en-us/f/default.aspx