Please note I'm using Ice Cream Sandwich.
I'd like to add a shortcut to a Google Contacts Group such as 'Co-Workers' to my home screen. Can I do that?
It doesn't appear that there is a native way to do this in ICS. However, you could use the folders feature in ICS to add multiple contacts to the home screen and group them into a single folder. Not exactly what you're looking for, but this seems like it is the best native (non-3rd party) solution in ICS.