A couple of folks have asked me about where they can find sermons on the web that are worth listening to. I was going to compile a list but someone’s done it for me. Check out Unashamed Workman for a list of great material.
I’ve been listening to Tim Keller quite a bit recently, and have found him estremely helpful. Also worth noting is a series preached by Mark Dever giving an overview of every book in the Bible. You can find the NT here and the OT here.