>Now why do I have this desire to use "plow" for snowplow but "plough" for the thing used on a farm? Maybe something to do with "ploughshares" not "plowshares" in some Bible verse...and I like the coherent look of snowplow (although it's pretty sick that the two halves of the word don't rhyme - they look like they should!).

Funny, I read snow-plow to rhyme with sno'-go. Not surprisingly, I'd go for snow plough y'all know that I love those extra letters!