In my life:
1. Cell phone (iphone or other smartphone)
2. Keys
3. Credit Cards
4. Something for water (cup, bottle, whatever)
5. Writing Instrument and Paper
6. Pocket knife
I use cash very, very infrequently, but as a result of this forum, I carry more than I used to, but not really enough.
I just got back from a 48 hour in and out trip to Los Angeles and didn't spend cash once.