Have you noticed all those groups in Mac OS X with names that start with an underscore (_)? What do they mean? Well, that’s just the naming convention in 10.5 for service accounts. So in most flavors of *nix you would have an lpadmin group but in OS X you now have _lpadmin instead. Nothing sinister or weird, just a naming convention.
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Keyspan Serial Adapter
When you’re doing Xsan deployments you often run into situations where a serial adapter comes in handy. It might be the serial port on an Xserve, a Promise Vtrak, an Xserve RAID, a managed switch, a Fibre Channel switch or a UPS but it seems like it’s just a super useful little thing to have. Now, since the MacBook and MacBook pro do not have serial ports that leaves you hanging a little. So, this little guy comes in pretty handy: http://www.keyspan.com/products/usa19hs/