Come to Stony Brook, and talk to Erez Zadok. He is the creator of unionfs, he teaches (undergrad) Advanced Systems Programming in UNIX/C, and (grad) Operating Systems, and runs a lab devoted to (mostly) Linux filesystems. NetApp, Data Domain, and other high-profile storage companies (maybe you know Riverbed?) regularly hire his students for their knowledge of operating systems and C.
His class is why I love C, and you'll find many more like me if you come talk to him.
His class is why I love C, and you'll find many more like me if you come talk to him.