DIY concrete curbs for edging?

I know this is going to sound like a dumb question to some, but what the hey, won't be the first time.
Anyone know of a DIY method of forming concrete planting bed edges similar to the "concrete curb" type edging you see a lot of these days? Even if it's quite labor-intensive. I just can't afford to have it done professionally, and it really seems like the ideal way to keep grass out of the beds and make it easy to mow right up to the border.
TIA -- **************************************************************************** *** I have learned that success is to be measured not so much by the position that one has reached in life as by the obstacles which he has overcome while trying to succeed. --Booker T. Washington **************************************************************************** ***
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