From the beginning, the LPI program was meant to be vendor-neutral; today, it pretty much is. With the backing of companies like Caldera, IBM, SuSE, Linuxcare, and Turbolinux (to name but a few), it should have become the Linux certification. As a mostly volunteer effort, though, its progress has been slower than the commercial certification efforts.
The most established and recognized certification is the RHCE. It"s also the most technically sophisticated of them all. You"re more likely to be taken seriously possessing the RHCE than you are with any other certification.
Despite its name, SAIR Linux and GNU is another commercial Linux certification that has no official connection to the GNU organization, although Richard Stallman does sit on SAIR"s steering committee.
For my money, I"d go with the RHCE. However, if you"re just getting your feet wet, Linuxmight be better for you.
Remember, though, certification does not mean competence. With Linux, the best way to find and keep a job is to have true expertise. No certification or book can give you that. Hands-on experience is the only way.
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