My personal preference is to use "they" as the first person singular gender-neutral pronoun. This will be /intensely/ irritating to grammar purists, but does seem to be the way the language is evolving.
"They" is /not/ a singular pronoun, and to me it just makes it look as though the writer is ignorant. The grammatically correct pronoun for third person singular of unknown gender in English is "he", since despite what some people claim. Living in Quebec, where French is common--a language that requires many more adjustments to change pronoun gender than English--one common compromise is to add a small notice at the bottom stating something along the lines of "The use of a particular gender in this document is purely for the author's convenience and should not be construed as excluding the other." - Scott McMurray