I'm using Samsung Galaxy 3 (GT-I5801). The ones listed as Dialer.favourites and contacts.starred in the 'Choose custom activity' are not working. This happens in both TouchWiz and ADWLauncher
If you use Dialer One as your dialer or even if you install it but use the default stock dialer app, you can get to the Favorites screen by long pressing a blank area of the homescreen, and from the SHORTCUTS menu, choosing FAVORITES.
I use Launcher pro as my Default homescreen and I can have a favorite contacts shortcut by doing the following steps:
1.Press the menu button and select the Shortcuts option
2.Then select the Activites option
3.Then select Contacts-->Phone
4.Give it a name
5.There must be a Favorites Shortcut