For what it is worth, here are my staples, the apps I cannot live without:

• WeatherBug
• Facebook
• Wordpress (for my blog)
• Wine Log (use to take snap shot of wines we drink, then tag then)
• Currency (checks daily conversion rates)
• Remote Control
• AIM
• Bank of America Mobile
• MLB.com
• Convertor (need to convert US to metric)

That is it for my most important. I hope this helps