If you have an issue exporting your push ceritifcate into .p12 format from keychain access (the option to export to p12 is disabled), check to make sure you have selected My Certificates on the left pane. We add push notifications to our apps from time to time, but some times we still miss this step and waste a few minutes on this.
When the battery on my SonicCare toothbrush runs out, it beeps to prompt me to recharge it. Without this alert, I would find myself with a dead toothbrush one morning.
Mint.com sends alerts to me when I spend too much or deposit a large sum of money into my bank. The alerts help me make sure things are under control and nothing fishy is going on with my bank account.
When you are operating your business, make sure you have the appropriate monitoring and alert services in place to provide you with valuable feedback regarding the health of your business. Alert may not be a good thing when it comes to user interaction, it's absolutely essential when it comes to managing the risk profile of everything you do.
Seriously, if you want to do Push Notifications without spending a ton of time sweating the server-side of things, look into Urban AirShip. I tried out their service the other day and got my push notification test up and running within 30 mins.
push in Development, Tips, iPhone 
