opushttp://
www.opussolutions.com
Carnetixhttp://
www.carnetix.coma new company, based in ATL, makes a separate startup and shutdown controller (SSC). Its the P1260 model and its basically a Opus without the built-in power supply. If you buy a case with an included power supply, the carnetix goes between the battery and existing power supply to control start up and shutdown. Its sells for $80. The downside to this is that its only designed to work with power supplies up to 60W. Most pwr supplies included with cases are 60W. But youre outta luck if you need more power.
Oh, just checked the Carnetix site. They have a new product coming out. Its similar to their previous version, but this adds a separate 5V/3A output specifically for USB devices. This is useful if your included power supply cant supply enough juice for all those USB devices.
The Carnetix and the Opus are the only commercial SSC's I know of.
IIRC, the laptop CD adapter is differrent from the laptop HD adapter. They each cost about $5. Its also possible to use an external USB or FirwWire enclosure that has these converters built in. This is more useful for the CD drive. IDE cables arent designed for long runs (trunk to dash). You can leave the PC in the trunk, mount the CD is the dash, and use USB or FireWire to connect to the PC. The adapters are designed to use the regular 4 pin power plugs. The external enclosures usually include a 2.5mm?? power jack, designed to be used with a normal 120VAC to 5VDC wall adapter.