Some useful cables for dl180 g6 tinkerers:
HP cable 536647-001 is really useful. It plugs in to the proprietary-plug wiring harness and provides a new Molex power connector with a nice long lead - perfect for powering SSD drives tucked into any corner of the chassis. The normal use for this cable is providing power to the rear-mounted two disk add-on backplane. I used it to power four internal SSD drives.
HP also has cable 491726-001 which is a very short cable that adapts the proprietary-plug harness to four SATA power connectors. Unlike the above cable, this is an end-of-the-line connector, which means that it will be of no use if you have the 12-bay backplane, since that backplane uses both proprietary-plug lines. If you have the four or eight bay backplane, however, with an unused proprietary-plug power connector available, this is a great way to power up to four SSD drives stuffed into the upper left of the chassis, in the two bays normally occupied by blanking plugs.
OKGear has a cable with the part number FLOP2MOLEX-C that takes the floppy/dvd power lead in the forward left part of the chassis and turns it into a Molex connector. This can then be adapted to one or two SATA drive power connectors. That corner of the chassis is a perfect place to stash two SSD drives, which is nice for ZIL or tiered storage in the upcoming Windows 2012 R2 storage spaces.