AppleInsider quotes Steven Baker, NPD's V.P. of industry analysis, saying "These have been, I think, pretty successful products for them (Apple), generating a lot of pretty decent average selling prices and decent revenue numbers."
I really like the iWork apps. My last book was mostly written on Pages, then sent off to the publisher as an RTF formatted file. Keynote is very powerful, and doesn't have the tired old look of PowerPoint.
Apple is apparently working on moving a good deal of iWork to the cloud, and Microsoft is taking the same path with Office.