There are a few mailing lists to subscribe to so you can take part in how the LDP works. First is <ldp-discuss@lists.linuxdoc.org>, which is the main discussion group of the LDP. To subscribe, send a message with the subject reading "subscribe" to <ldp-discuss-request@lists.linuxdoc.org>. To unsubscribe, send an e-mail with the subject of "unsubscribe" to <ldp-discuss-request@lists.linuxdoc.org>.
Another list is the <ldp-docbook@lists.linuxdoc.org> list, which is for markup or other questions about DocBook itself. If you run into trouble with a particular markup tag, you can send your question here for answers. You can subscribe to the DocBook list by sending a "subscribe"message to <ldp-docbook-request@lists.linuxdoc.org>.