ARM processor ARM7 vs. ARM9

I am new to ARM processor, right now i am learning ARM7TDMI-s, but currently in industry they are using ARM9, i want to know the advanced features of ARM9 compared to ARM7.
ARM processor ARM7 vs. ARM9

I am new to ARM processor, right now i am learning ARM7TDMI-s, but currently in industry they are using ARM9, i want to know the advanced features of ARM9 compared to ARM7.
developing library to communicate with processor ARM9

we intend to write a library, /api which will communicate directly to the processor, will you please guide us how to work towards this thanks
programming application for nokia 6600 ARM9 processor

hello friends , i want to make an application on nokia 6600 processor , so how can i proceed ? if any one have any idea surely reply me. thanks in advance kaushik
any free compilers of ARM9 processor available???

hi friends if there are any free compilers and debuggers available on net for ARM9 processors , then please tell me. Thanks in advance kaushik