For trimming a straight line, say under a fence or
against a wall, you can't beat a scythe.

It's only good against posts depending on your
skill - you don't want to bury the tip in the side
of the post. A wall self-directs it to the right
place, by contrast.

It's no good in enclosed corners, which will leave
an arc that you can't get to.

But no gas, no noise, no effort.

I get mine from www.scythesupply.com (no
connection except as customer). I cut an acre of
lawn with it, but that's maybe a little extreme if
it's not an actual hobby.

A couple hundred random pictures over the years
http://www.flickr.com/photos/rhhardin/tags/scythe

Get their grass blade unless you're going to cut
woody things, and a straight (not bent) snath.
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On the internet, nobody knows you're a jerk.