Here comes the bride, surfing online. Where is the groom? He's in a chat room.  XO Group (formerly The Knot) is a leading online publisher serving the wedding, newlywed, and new parent markets. Its TheKnot.com and WeddingChannel.com sites offer wedding-related content on topics from engagement to honeymoon, as well as wedding planning tools (budget planner, gown finder), chat rooms, a directory of local resources, and online registry services. Other XO Group websites target newlyweds (TheNest.com) and pregnant women and their partners (TheBump.com). The firm also produces branded video and mobile content and magazines, as well as books on lifestyle topics (published by Random House and Chronicle Books).