Agreed, leinengen is a major part of what makes working with Clojure so awesome. And if you haven't tried out technomancy's work with Heroku, try spinning up an instance. It's incredibly well done.
Could you please elaborate on that? I'm not familiar with the work he's done with Heroku.
With the arrival of technomancy at heroku, they also provide a full-stack Clojure platform for your Clojure web applications, with a free version for those interested in experimenting.