Should I learn PHP?
It probably wouldn't take very long to learn, and it seems like a lot of folks like it. Is it worth it - a.k.a. will it get me more clients?
According to The FuzzyBlog!, Yahoo likes it. Read why Yahoo will use PHP over all other open source technologies. Personally, I think they chose PHP because they have the inventor working for them.
I think I'll pass on learning it at this time - I'm having to much fun with Java and all it's goodies.