At 7,000 download at the time me writing this, WordPress Landing Pages is gaining some traction. The feature-set is alluring, but there are some bugs here and there (ex: blank pages now and then, conflicts with other plugins). The author responds well to support requests, so the possible bugs aren't an issue if you're patient. The templating system works great to match your existing theme, but the other offered templates are poorly designed. I didn't have time to dive into the custom templating, which seemed like one more thing to learn that I didn't have time for--but I like the idea that if I had the time I could make a totally custom template. The offered blank template is handy for developers/designers as a launch point. The UI is ok, but isn't quite polished enough to be with the big boys. Given its trajectory, this is going to be a killer plugin in no time at all.
Take it for a spin and see for yourself. I'm going to check back in after the plugin grows for a little while longer.
Hat tip to the authors. Keep it going!