Just try advertizing your guild on the guild boards and have a link to your guild in your userlookup. If you are constantly talking (although not too much) about how great your guild is, people are bound to check it out. Make sure you have a good layout and logo, thats the first thing people see when they go to your guild. As for the inactive members, send a guild mailer out saying the times you will most likely be on the guild message board waiting to chat with them. The first step to getting the members active is them wanting to be!

ps-these boards are like the neoboards. It could take a while to get a response and "bumping" the board doesn't really help