Opened up my computer to clean it and install a few things. I wasted a ton of canned air before I realized that the filter could be removed and washed. I also taped up the side vent and removed the top fan. I know it sounds backwards, but this way all the air is pulled through the front fans and the filter. The serial port bracket didn't have a long enough cable so I couldn't install it
The USB/Firewire one worked, sort of. The Firewire half didn't even fit into the connector on the motherboard, it was like inverted or something. I cut it off and threw it in the bin. I tried to install the USB part alone (hacksawed off), but a screw got in the way. So I pulled it off, filed the ex-Firewire holes bigger, and stuck the USB ports there. Now I have a clean, more aerodynamically efficient case and some extra USB ports. Sadly, it now has a totally different acoustic profile, including a really annoying rumbling. I think it's the bottom fan blowing on the PSU cables, maybe I'll do something about it tomorrow.
I also assembled a Minecraft server with some old and some new parts. Core 2 Duo E6300 (used), MSI G41 motherboard (new), 4GB Patriot DDR3 (new), 320GB Seagate SATA HDD (used), SPI 400W PSU (new), ASUS DVD-RAM drive (used), random floppy drive (used) and a cute little Compaq enclosure (used). With the exception of the floppy drive, none of the parts are original, and the specs sticker that was still on it when I got it is now a total lie.