This is how you start an article. I didn't read any farther, but my already high opinion of quirksmode.org is even higher.
I should say, though, that it does mean that the content of that summary, and of the headline, becomes extremely important. For instance, you could nominally cover a news story, but write a boring headline and summary, and very few people will trudge through that to find the really important details later on. You do sometimes find that occurring on the BBC site, especially when it's a story which might raise a lot of controversy within government.
Was there a time when teletext was actually used? Honest question, I was under the impression that it just never managed to catch on.
Edit: if it's unclear, this is not accusing anyone of bias: good writing should make any involvement in the subject matter explicit. See http://en.m.wikipedia.org/wiki/Appearance_of_impropriety The article is sponsored by modern.ie which is a Microsoft initative. I happen to agree with the article, however being forthright about these matters would strengthen its point.
The "inverted pyramid" someone else linked to here means that the information is presented from most to least important, so you can stop reading the article anytime when it starts to bore you, and still know you have read everything you want to know.