Clients I worked for so far, just a small selection:

In the field of customer goods:
» Coca Cola (Coke Light und Coke Light Lemon)
» Mezzo Mix
» 3M
» Zewa (SCA)
» Sony
» Vöslauer

In the field of telecommunication:
» T-Com
» T-Mobile
» AOL

In the field of pharma industries:
» 3M Pharma
» Durogesic

In the field of financial services:
» UBS (United Bank auf Switzerland)
» Postbank
» Stadtsparkasse Köln
» Deutsche Vermögensberatung
» Axa
» Hamburg Mannheimer
» HDI
» Continentale

For some more details check the
following showcases.