With criteria like quality and usefulness, its hard to beat some of the stuff from Design Chemical
I nominate the following social sharing plugins, good for business and blogshttp://codecanyon.net/item/jquery-social-media-tabs/1932796
I like this one: http://themeforest.net/item/aswad-facebook-template/3437580
I decided add this items:
I want to nominate this great corporate track http://audiojungle.net/item/inspiring-moments/912044 and this new great video http://videohive.net/item/dynamic-typo-box/4087105
This one rocks: http://themeforest.net/item/verendus-responsive-business-template/3603918
I agree, Somnia Themes made a great new theme, Verendus.