You can easily get a list of users and their assigned Office365 licenses through the Windows Azure Active Directory Module for PowerShell.
Connect to your Office365 tenant through a user with Administrator permissions:
Then, enter this command:
Get-MsolUser | Select DisplayName,Licenses | FT
You can also append the following to export it to a CSV-file.
... | Export-CSV -Delimiter ";" ~Desktopmy-export.csv
The Licenses column tells which license is assigned, but it uses different names than what is visible at the WebPortal.
These are the ones that I know of:
|STANDARDPACK||Office365 Enterprise E1|
|ENTERPRISEPACK||Office365 Enterprise E3|
You're welcome to add additional types in the comments section. Then I'll add them to the article.