ROM tweaks HOWTOs

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Hello, now that UI have looked at my MDA Pro (german T-Mobile) I would ike to get into tweaking the ROM. Therefore I would like to know what this extended ROM thingy you have been talking in here actually is. Why would I need an extended ROM ?

Since we are talking about ROM here, this is what I want to do:

There are some apps that I really would love to get rid of: emailwizzard, clearvue PDF, but since they are in the ROM I just can't delete them. Also I don't really know what Files I actually need to delete and what esle I would need to do to delete it CORRECTLY.

Also I really would love to get rid of the carrier logo in the Phone App. I probably have to delete carrierlogo.gif. I trid to do that using total commander only to find out that it is not deletable (nor renamable) , borbably because it resides in the ROM.

So to sum it up:
1.) what do I need to do to achieve the above described two goals
2.) what is the benefit of having an extended ROM ?
3.) what do I need to do to create an extended ROM ?