My case has an after-market side window. The rubber it came with to hold the window in place never held it there very well, so there is no longer any rubber at all. Just duct tape wrapped around it.
Computer itself is pretty shitty for now, until I'm able to upgrade (hopefully soon)
Currently:
AMD Duron 750 (First thing to get upgraded...)
384 MBs PC2100 RAM
RADEON 8500
30 GB Western Digital HD (Second thing to get upped...)
A7N8X Deluxe Mobo