ArsTechnica has a review of AmigaOS 4.1 and a brief interview with Thomas Frieden on the last page.
As usual its an informative and interesting read.
The reviewer "Jeremy Reimer" seems to be a long term Amigan and obviously has a like for the system. He also wrote the
History of the Amiga series of which there should be another installment coming soon (apparently).
Ars Reviews AmigaOS 4.1