As mentioned, OSS projects often lack the "unifying cognitive model". I've also found that with iphone apps, users expect a high level of polish on an app. (A l

As mentioned, OSS projects often lack the "unifying cognitive model". I've also found that with iphone apps, users expect a high level of polish on an app. (A little drop-shadow here, a little shine there, move that button 1-pixel to the right, etc.) It's tedious and fiddly work, and I only bother because I don't want to lose a sale. People often say about 80% of the app is interface - with the iphone, i'd say it's closer to 95%. If OSS projects were able to motivate developers to work on the boring stuff like graphics and layout, the apps would look a lot better and adoption on the desktop would certainly shoot up.