Help Few problems with my G1

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Right, first up I'm new so I just wanna say Hi. I love my G1 and I think Android is simply amazing!

However, I am having a few issues with it. I have the 2GB SD Card in my G1 but which folder to I put all my music and apps in? They are all currently on internal memory and I need to free up space as it says low memory or something similar, I was curious to know is it possible to move apps to SD Card also? Why when you take a pic does it now get saved straight to Card?

Thanks