WPLover provides some tips for launching your new WordPress theme. Here’s a snippet:

The first thing to do is to write about it in your website. Either as a blog post or a specific page, it doesn’t matter, as long as it’s there. This is to be the home page of the theme, which will serve a bunch of purpose: you include the link to this page inside the theme’s style.css, you link to it when announcing your theme, people can come to it to comment and ask around if they encounter some problems, and so on.

Aside from mentioning some prominent sites where you can announce the theme, the article goes into detail about creating demo sites. You can also check out the author’s workflow for announcing and submitting new themes. Great stuff for anything you may have missed in your own workflow.

When you’re done promoting your new theme elsewhere, don’t forget to submit your theme to our website!