Here's pictures of some of the various cards, for those interested:

Twin Turbo - http://i30.tinypic.com/5f2psz.jpg Close up - http://i32.tinypic.com/14sfotk.jpg - Got three of 'em

Apple Ethernet Card - http://i27.tinypic.com/2rr6rlc.jpg - Also have three of them

ATTO SCSI Card - http://i32.tinypic.com/9a0aq8.jpg - And a similar one - http://i31.tinypic.com/98u89z.jpg

Radeon 7500 - http://i32.tinypic.com/ojdush.jpg - I think....?

Griffin gPort II - http://i28.tinypic.com/x3ybmf.jpg - The others all go in the modem hole, this one has a PCI slot cover.