@hazelnut - that's good to know about the vegetables on former lawn soil. I'll have to keep that in mind going forward.
Here at our house we have begun bagging our clippings because after not doing it for a year or two, our lawn was getting so congested with thatch that even after paying someone to de-thatch our yard, it was still really bad. Part of our problem, though, is that we have compacted, clay-like soil-ugh!
Next year, hopefully, we're going to bring in a truck or two of dirt again before we dig up where we're going to plant our row of blueberry bushes. Our yard really is a work in progress and soil nutrient information is definitely something I'm trying to get a better grasp of.