I too have seen it mentioned several times, even from members here who load thier bullets close to or just touching the lands. You can even buy fancy gauges from Hornady that you can measure your chamber to so you can get your bullets right on the knats booty.
Loading like that is not a guarantee that you will see greater accuracy, as it is with any other method used to achieve greater accuracy. It's just a matter or testing at different lengths, powders, charges, primer, etc. that will hopefully get you better accuracy. And like others have posted, they are loading to the cannelure and have great results. So, theres proof right there that you can achieve great accuracy loading at the lands, or just off of them, or not even close to them.
(Boy, I sure used the word "accuracy" a lot in that post......