I noticed that in Germany you can find some nice books about MicroFourThirds cameras. Now they have two new books:
The Profibuch Olympus PEN: E-P1, E-P2 & E-PL1 (Gebundene Ausgabe) and the Digital ProLine: Das praktische Handbuch zur Panasonic Lumix GF1
Other countries do not have that choice. Amazon UK lists only the Magic Lantern Guides: Olympus E-P1 (Magic Lantern Compact Guides).
The same book is available for US citizen in amazon: Magic Lantern Guides: Olympus E-P1