Platform is an drag-and-drop theme-design framework for WordPress and HTML5. It will help you do amazing things with your site, faster & easier than ever before. Designed and developed by PageLines in California. Twitter @pagelines
All-purpose, responsive (mobile friendly) theme with 12 optional layouts, per post layouts, multiple drop down menus, 18 widget areas, support for all 10 post formats, mobile compatible menus, and integrations for bbPress, BuddyPress, Jigoshop, and Hybrid Tabs.
Simple WP Community Theme is a three-columns, widget-ready Buddypress theme. It comes in a dark dressy design with a community-navigation widget. It is 100% WP 3.0 compatible, e.g. custom menus. Also it has a custom header to change text color or add a logo or background-image.
A nice subtle child theme for BuddyPress. You can upload a custom header (or download a blank one at: http://angelicaflorine.net/goodies/wordpress-goodies/my-buddypress-theme/). Widgets can be used with this theme as it has been formatted using the default theme. Feel free to share, but do NOT feel free to steal! :)