The other day I saw someone mention in a post here that it would be nice to have MarketPress shortcode buttons on the posts / pages editor. Well, I thought that that could be handy too, so I built a full blown MarketPress shortcode helper that let's you generate MarketPress shortcodes with a few easy clicks. I'm trying to get it hosted on WordPress.org, but in the meantime you can download from here: http://watersedgeweb.com/plugins/marketpress-shortcode-helper/ and install it just like you normally do with any other plugin.
If you find this useful, please send me some rep points so I can inch my way a little closer to 1000. Thanks!