hey waffler
my AGP slot is last in line (counting from edge towards centre)- i.e. its more or less in the middle of the mobo at the back.
It looks almost the same size as a PCI slot actually.
Also, its length means that it does not go right back to the case edge like PCI slots do, theres a gap.
Any idea what mobo u have? Might be easier and more accurate to give you an answer that way.