Penumbra members have authored and contributed to IBM Redbooks and all variety of Lotus Notes and Workplace publications.

Security Considerations in Notes and Domino 7 (co-authored by Paul Ryan from ProcessStream and Richard Schwartz from RHS Consulting and Dieter Stalder from STDI) IBM Workplace 2.5 Development with Workplace Designer (co-authored by Adam Egressy from AdHoc, Rob Novak from Snapps) Portalizing Domino Applications: Integration with Portal 5.02 and Lotus Workplace 2.0.1 (co-authored by Martin Anderle from AdHoc)

Lotus Domino for iSeries Sizing and Performance Tuning (co-authored by Kim Greene from Kim Greene Consulting Inc.)
Lotus Security Handbook (co-authored by George Chiesa from dotNSF)