Well from the code you pasted there is a quote missing before tabs. Not sure if this is the mistake or a copy paste mistake.
add_shortcode( 'tabs', 'sds_tab_group' );
looks like a nice bundle
But one problem with the announcement banner at the top. Firefox (7) on windows keeps it hidden when you click close but not firefox (6.0.2) on mac. I get $.cookie is not a function. Thought i would share it
oh my bad. I don’t think there is an api for the tutsplus websites. As far as I know
Envato has an api which works for all marketplaces. Checkout their wiki page http://wiki.envato.com/community/the-api/envato-marketplace-api-applications/