I read NiTessine's Dungeons & Warhammers thread for the first time today and really enjoyed it, it is extremely well written. NiTessine had posted a kind reply to my Jodo Kast Does The Adventure Path story hour, so I checked out his story hour and loved it. I might not have ever checked it otherwise, because I know nothing about Warhammer and so the title did not intrigue me.
The same can be said for Horacio, who has a solid superhero story hour going on that I might have missed if Horacio had not posted so frequently to my old story hour. So I think the best way to pimp your story hour might be to post encouragement on the story hours of other authors.
Knightfall, I will check yours out tomorrow or Wednesday, depending on my schedule. Of course, if you happen to post to mine it will remind me to be sure to check yours out!