In my opinion the underside of the blade should be flat so as to avoid dirt pick up. Dirt collects under the blade.
...and in all the other humps and hollows.
I'm not sure if you're a keen gardener or not Sara but anyone with a garden could do with a hoe, I use my hoe for several jobs besides weeding. I will show you what I get up to with my hoes some other time though.
I saw while watching the TV tonight that the Royal Mint are selling £5 coins for £5, if like me you're thinking there is nothing special about that deal wait till I tell you that carriage is £1.95. So if y'all want to get your £5 coins for £6.95 go to http://www.royalmint.com/ Personally though I'm going to wait until they put on a 2 for 1 offer. By the way, I think there is supposed to be something special about the £5 coin in question.