Here's one: Don't let your co-founder also run another, related startup at the same time you're getting yours off the ground.
Don't start a company with someone you have a relationship with (companies tend to outlive them and then you're stuck with awkwardness).
So many counter examples to this, I'd be more interested in a single example demonstrating your point.
Uhmm... Pownce?
Considering her audience was likely quite technical, that presentation wasn't exactly enlightening. Hopefully she verbally expanded on the bullet points substantially.
Audio for the talk will be up in a few days
I agree. I was amazed that she mentioned using version control. Anyone here not using version control?