Over time, Microsoft has continuously upgraded the size of Office365 stores such as mailbox size and site collections without raising service pricing. That trend continues with the announcement of 1TB of storage for SharePoint Online.
http://blogs.office.com/2014/03/14/sharepoint-online-announces-1tb-site-collections-and-unlimited-tenant-storage-scale/#.U0RQ-V939d0.twitter for details.
Here's an interview with the infamous Gary Denvendorf on the Office team at Microsoft. He demos some of the cool stuff in Access that let's you build an application then publish it SharePoint Online!
Check out this collection of free SharePoint training resources.
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