[Development tools for ARM7]

Hi,
I'm been thinking to start to play with an arm processor for a while, but I'm not sure how much it will cost to setup some kind of basic evaluation kit.

What tools do I need and where can I get it, preferably free tools if there are any? IDE, assembler, compiler, simulator, debugger (in-circuit), tools to program the processor, etc.

If someone has experience from some nice tool let me know.

/Thanks

[USB hard drive - microcontroller]

I need some guidlines on this subject.

I plan to build a mp3 player which will use an usb hard drive as a memory. Have looked around but doesn't found any information on how to begin (Theres are a lot of information about usb but not on how to communicate with a hard drive).
So if you anyone have any clues or maybe you have already buld one I would be glad.
I will try to use the maxtor oneTouch disk (it's has only USB interface).

Thanks