What kind of optmization?

I've found this good presentation about indie-developing, but can be applied to every programmed-related task.
In particular there are two points I agree completly:

1. what do do you need to optimize is not your program, is your life,
2. complicated algoritms are not good

What I need, as hobby-developer in spare time, is a plan, really. Many times I've started so many projects, but after few hours they are just some code on my hard-disk, nothing can be showed around.
So thinking about this hobby, what are my ideas? We'll see :D