Hi,
CustomView gives you the number of agents currently logged in either from "Agent Summary".num_signed_on
or you can count then by their state from the "Agent" or "Agent Group" tables.
From the database it is possible, too: Use the table "event detail" (eventdtl) to track logon/logoff events using a global variable (counter) in a formula within the detail-section of your report, then you can print min-/max-/avg-values of simultanuous active agents for the day or whatever intervall vou need...
Bye,
Chris