seaworthy - 4:06 am on Nov 24, 2011 (gmt 0)
I've had numerous errors pop up in WMT recently, mostly as a result of actually trying to fix my sites.
Most of the time are 404 errors due to merging content and deleting low quality stuff. I'd probably take more of an interest in fixing those sorts of errors if I knew how to fix them.
I guess it is prudent to learn now.