So here are the main things you can do and see in the archive just to get you started.
Overview of messages sent
The first thing you see is the general overview of the sent messages throughout a period of your choice. You can either use one of the quick options: last month, this week, tomorrow (just kidding :)) or select a period between two specific dates.
Messente displays all the sending activity, draws a small graph describing your SMS traffic during this period. By clicking on the total SMS number of any of the sendings you can see every single message separately including full delivery information.
Last but not the least you can download a .pdf report with all the sending activity so whenever you want to share this information with someone who does not have access to the account you can just send them the report via e-mail.