Change "layout" for Bib References

Hi
I very glad to see the inclusion of the Bibligraphy refefrences. But how do
i Tweak those or create my own?

I want something like [Aurthor, 2006] where most of the included formats
uses () instead of []. This is my big concern, another great feature would
be to allow Web site references to be rendered slightly diffrently like
[Microsoft, 2006:URL].

Is any of the above possible? I have looked at a file called BIBFORM.XML but
it don't think it is the right thing (I don't hope since it is huge and
impossible to undestand, at least without gudiance)

Thanks

Anders J