Lookin' good to me, Dave! And you seem to have some red dirt like I do, or clay. Looks like you've mixed in some nice dark stuff though. That garden will look great this summer, no doubt about it.
Greene, yep, what Dave said, but I liked my outsides square 'cus it makes it easier to keep grass/weeds down if I have to mow/weed-eat along the edges. However, your suggestion would be perfect if someone wanted to put a 2X6" cap on top of the sides of the beds for a comfortable place to sit, and those 4x4 blocks on the ends - and one (or two?) along the middle length would give support to the ledge, eh? I made ledges on one persons garden and ran an extra 2x along the length underneath it for support.
Dave...this picture must be the epitome of the "coffin beds", eh? But with a ledge/seat on the side you can more comfortably view the dead.
Then again, if those folks end up being good gardeners they'll be viewing the living. Yay!
(Shoe..who had spring here yesterday and now snow/ice moving in this afternoon. Go figger!)