Some people in this thread keep saying to hold onto your equity, but I don't mind giving some up to partner with people that are experts in something I know I am not that good at.
When I started my first company somebody advised me not to take on a partner to do work that I could hire someone to do.
I didn't listen, because I was willing to part with equity in exchange for unlimited access to a particular skill set.
I figure that playing loose with my equity cost me at least $400k over three years.
Might not be a lot of money to some people, but I'd rather have it than not.