mmm the feature list is impressive, but IMHO it may be a good idea to choose other colours for the screenshots. Maybe showing an "OS4" theme and a MorphOS theme would make it look more professional. I think that thin borders usually look better than bigger ones too.
These suggestions are just cosmetical ones. BTW, how are the MOS/OS4/AROS ports going? having Feelin running in more Amigoid systems is important if you really want to make it widely used.
To make it look more integrated with the system I would use the default window font as default feelin window font. It doesn't look nice to have small OS windows and big Feelin ones. And I would make it use a border of the same width as default too... if the user chooses other settings, ok, but default one should mach the rest of the OS.
It would be nice to show how good is image integration too (like having images in the listbrowser columns, having images inside the GUI, or just backdrop images). It would make it more attractive.
These two images use better colours than the other screenshots IMHO...
