1. WIDGETS / GADGETS> Both Mac OS and Vista have set the standard. Users will expect to see these. Make a couple (clock, weather) start by default
A lot of people are shocked if they read about superkaramba because they were looking for their gadgets on a first linux experience and get a message with "PyQt is not installed or wrong version" etc.
2. people coming from other OS'es don't know the name Kopete or Gaim, they probably only now MSN, so choose a messenger to be on the desktop as a shortcut as default and rename it to kopete messenger or whatever so people know immediately where to find a messenger without knowing the names of applications (I know a lot of people who only use MSN with a headphone on their heads, listening to MP3 and that's it)
3. Replace Konqueror with Firefox as default browser(or opera), people coming from other OS'es probably never heard of konqueror and firefox is familiar for them, konqueror stays their filebrowser of course.
Konqueror has too much problems, hit 'show inbox' for a MSN account for example, it will stay in a loop instead of showing their inbox.
Some online banking sites don't allow konqueror.. yes you can fake another client but people coming from windows think "huh, it doesn't work, let's get back to windows".
Is it possible to implement Cedega in the future or something like that ?