Capabilites as of March 2006 includes the following:

Mailpiece Preparation
Wafer Sealing
Envelope Insertion
Inkjet Addressing
Label Application
Mail Merge
Laser Printing
List Aquisition and Preparation
Mailing Lists (geography, income, building type, etc.)
CASS (Address Look-up and) Correction
Move Update
Postal Presort
Postage Discounts
Presorted First Class
Presorted Standard (Bulk Mail)
Presorted Non-Profit