Singing exercises to help me improve - Breathing

As i previously said my weaknesses in singing are breathing, dynamics and pronunciation.
To enable me to improve on these three areas, i will need to do some voice exercises that will focus in on these weaknesses.

A breathing exercise that i have found to be effective is breathing in for four holding for four then out for four, found from the source:
http://voiceexercises.wordpress.com/2011/01/05/voice-exercises-and-breathing-tips-for-singing/

"Ideal breathing during singing engages the diaphragm. Rehearse the routine outlined below to strengthen good breathing patterns.

* Breathe in deeply, then let out your breath fully
* Take a breath and let out your breath
* Inhale once again, only this time, breathe in for four seconds. Maintain your breath for 4 seconds, then let out your breath for four seconds and wait four seconds prior to breathing in yet again
* Replicate the four second breathing exercise 3 times repeatedly

Inhale 2 3 4, Maintain 2 3 4 Breathe out 2 3 4 and Wait 2 3 Once again.
Breathe in 2 3 4, Maintain 2 3 4 Breathe out 2 3 4 and Hold 2 3 Last Time.
Breathe in 2 3 4, Maintain 2 3 4 Breathe out 2 3 4 and Hold 2 3 4."

Another breathing exercise i have tried is taking in a breathe and then counting until out of breathe, I have found a youtube link to this exercise
 from 2:10 onwards.

These two exercises are very effective as they help to increase the lung capacity and this will enable me to hold notes for longer whilst singing.