On Thu, 30 Jun 2011 22:33:19 -0700, "Bob F" wrote:

wrote:
"burn" it down with roundup, then till and remove as much rood matter
as possible by raking - wait for it to green up again (water it if it
doesn't rain) then hit it with roundup again to kill it, and till it
again - removing as much root material as possible.

Skip the roundup. Tilling weeds under shortly after they sprout will kill them.
Just do that several times. It worked great for me converting a weed patch to
ornamantal garden beds. I tilled 3-4 times over a couple months of a Seattle
summer.

Another method I've heard is to till the ground, then cover it with *clear*
plastic over the early part of the summer. The light encourages the weeds to
germinate then the heat cooks them. Grass can then be planted in the late
summer or early fall, which is usually the best time to do it.