I recently came across The Cripplegate and I think it's a must read blog. So much good info here that I have yet but scratch the surface.
One of the more recent posts is the second in the series on grumbling. And let me tell you, it really hit home for me. This combined with Sunday's sermon dealing with (among other things) pride and self-righteousness - and I'm all sorts of humbled...
But enough about my shortcomings. Here is a link to the article and I encourage you to check out the rest of the site.