I think it's definitely worth it. I work in the I/T department of a large medical diagnostics company and we (myself and one other person) have been testing Linux on some servers. My boss is well aware of my love for Linux (I have a poster in my office that states MS is the evil empire) and he mentioned to me the other day that maybe it would be a good idea to start working on my Linux certifications. LPI is one that I was looking at, as well as the RHCE (very expensive) and Linux+ (very inexpensive) certifications. I think the Linux+ certification would be a very good start. Check out http://comptia.com/certification/linuxplus/index.htm . It looks pretty interesting (and it's fairly new).
I'm pretty excited about actually getting to work with Linux for a living.