Either everyone in the Fray went to the same school, or else those pesky English professors have a lot to answer for—a surprising number of posters say their teacher told them not to use the semi-colon, the punctuation mark fighting for its life in Paul Collins "Culturebox" article here. Karlilfishnu's professor said that three semi-colons was a lifetime's supply. John123 wasn't having any nonsense after hearing about similar views: "I think what your professor really meant was, that semi-colons promote a clear grasp of logic and complex thinking; which should be avoided at all costs."
Anyone worried that no-one cares about correct punctuation any more would be greatly cheered by reading the Fray—this was a popular subject, and very few people were arguing for more laxity. There were plenty of jokes about colons: our favorite was Arlington's "What about Condi Rice? Isn't she a kind of semi-Colin Powell?" In the important view of the Fray Editor, a colon appears in the previous sentence because the second part exemplifies the first. If the second part had been a contrast, something like "but others thought the subject far too serious for jokes" then a semi-colon would have been necessary. Many others wanted to discuss correct usage—Nemesis was short and to the point:
The nearest explanation I can articulate is that the semicolon puts related ideas together in the same sentence when a comma wouldn't do and a period would require repetition in the next sentence.
and Earlybird gives an excellent full explanation here, with examples.
There was a curious quality of found poetry in this entry from Kemper—it doesn't follow the rules but it's vivid and you know what it means:
I was taught not to use the semicolon unless the boat was sinking and you had no other way to; for god sake save the sentence or as a continue of the same sentence but why would you do that for goodness sake. I am not great at writing but find it useful yet; hold up every time tempted; yes so tempted, to continue a thought yet finish one, giving pause to the forementioned thought.
And perhaps more intended poetry here, from Chroniccommentator:
Semi-colons hang in a sentence like the scent of jasmine you inhale before you walk on to another part of the garden. They let you linger for a moment, and then you move to another flower--but still in the same garden.
Demilune had other things on his/her mind, and clear views:
Love the little buggers [semi-colons]. Don't use them a lot. Matter of respect, you know. Now, on the subject of which/that, isn't there a nice philanthropist out there who will donate a copy of Strunk & White['s Elements of Style] to all writers everywhere?