just a few small questions

[MM]

>> Why is there a open source frontend, or better: Why is D not opensource?
>> (no offence intended)
>
>The frontend is open source, but the backend is shared between D and Digital 
>Mars's C++ compiler, DMC, which is a commercial product.  If you want a 
>fully open-source D compiler, look for GDC (though it isn't always 
>completely up-to-date).
>
Thx... but ehm, I can use D commercially but the backend? is a commercial
product?
Do I need to buy this? (I can't even find a page where I see any purchasing :D
(backend = the actual compiler?)

>There are bindings to both on dsource, I believe.
Is a binding just as fast as a 'normal' implementation?