On the LispCast blog there's this recent post comparing (surprise) Lisp and PHP and the latter's popularity in the online development communities.

My question is this: how did PHP get so many libraries, get installed on so many computers, and attract so much developer attention in the first place? [...] To summarize: Lisp is marketing itself poorly. Lisp either needs to get competitive on the ease of use and productivity front, or lose programmers to other languages.

He mentions this post from Brian Carper and this response as two places bringing up good points about Lisp and its community.

That's one of the things that PHP has going for it over Lisp - the community. PHP's community is constantly pushing, reaching out to the developers with simple tutorials and (usually) useful libraries. He makes a call to the Lisp developers out there, though:

The day will come when Lisp won't be cast aside as a quaint relic of bygone days. On that day, Lisp will be seen as equal to the big languages. And it will learn from and share with them as peers.