I've seen several themes where the weather shows up on your BB so I downloaded an app called BB Weather and I am having problems setting it up. Is that the program I need to have the weather show up on my home screen? Or is there another app that does that? I would really like to know...thanks!
I'm pretty sure that what you are looking for is a custom theme that has a weather slot included on the homescreen. I personally am using WeatherBug as my weather app.
Take a look in the theme section: http://forums.crackberry.com/f148/
Simply download a theme that appeals to you and has a dedicated weather slot, and you should be good to go.
Or you could go with BerryWeather and use it's homescreen wallpaper feature and have the weather on your homescreen no matter what theme you use. Sorry, I love BerryWeather and had to throw it out there.