Lisa Robinson guest posts on Parchment and Pen on what it means to worship God. I found it thoughtful and biblical and generally in line with thoughts I have had ever since reading D. A. Carson's essay in Worship by the Book (which I could not recommend any higher). The anecdote she presents and her response always reminds me of the "I don't care about your sacrifices if you aren't living obediently" injunctions in the Prophets (e.g. Isa. 1:11-17; 66:3-4; Amos 5:22ff).