What certifications allign to different positions?

I guess my questions is which linux certifications are for certain positions? Helpdes/desktop support, junior administrator, system engineer?
Thanks in advance,
win2k4
Thanks in advance,
win2k4
Comments
Linux+ and/or LPI-1 for HelpDesk
LPI-2 for a Jr System Admin
RHCA/RHCE for System Admin
RHCE for Engineer
I'm not familiar with the various Solaris/Sun/Novell/Suse stuff to make a call there. Also, you specifically asked about Linux certs for (I am assuming) Linux support roles, but even in a Linux environment extra certifications like A+, Net+, Server+, Security+, and the like will make good additions. Also, knowledge of perl, python, shell scripting, C, and others will be a great help in those environments.
Ah, I stand corrected on the Red Hat, thanks. I remember that now.
I knew there was supposed to be a level 3 LPI but hadn't seen or heard anything concrete. Looks like it was supposed to launch in january of this year:
http://www.lpi.org/en/lpi/english/certification/new_lpic_3
There do not appear to be any books written for the LPIC-3 though.