The following themese are recomendations from a published article in Web Designer magazine (January 2012)
Free Themes
Liquorice Theme – http://wordpress.org/extend/themes/liquorice
Black Board – http://wordpress.org/extend/themes/black-board
Adventure Journal – http://wordpress.org/extend/themes/adventure-journal
Premium Themes
Headway Themes – http://headwaythemes.com/
StudioPress Genesis Theme – http://www.studiopress.com/themes/genesis
Theme Forest – http://themeforest.net/