So I got my Mediator board from Astral today and am wondering now what software I need to get this up and running. I realize I'm going to need a case as well as a thing to bend my PCMCIA port, but I'm not sure what else.
I have the keyboard adapter which I also got from Astral, though I did not receive any software. So...
what softs do I need, drivers, hardware, etc.?
Thankx in advance! 
You'll also need the Mediator software to make it work, and if it's an old one, it may need a couple of the chips upgraded to enable some cards. Which cards are you planning on running with it? Once the software's installed it generally just works without any messing about. AmigaKit have that PCMCIA right-angled adaptor if you need it...
As for the keyboard adaptor, that shouldn't need any extra software - the decoding/recoding is done by the small processor in the adaptor itself, and to the Amiga it just looks like a standard keyboard.