My specialty is Search -- I was CTO and principal author of Infoseek/Ultraseek, which was highly regarded until Disney bought the company and killed it (RIP). Ultraseek passed through the hands of Inktomi (as Enterprise Search, as in Big Billboard on 101) and now belongs to Verity.
I'm designing a community web site (of a different purpose than LJ) and seriously considering the LJ platform. Of course, I will need lots of help!
(I don't know if this "solicitation for help" violates a rule or not -- if so I sincerely apologize.) If someone knows someone I ought to talk to, please let me know.