lucy24 - 5:11 am on Nov 24, 2012 (gmt 0)
It doesn't cost any extra to have an htm at the end and it was a convention I have used since 2000. I don't think NOT having an htm will affect the rank.
The "uhm" was a reference to "I agree" (with post about no extensions) ... followed by an example with extensions. And I've been using .html since, oh, 1994 or thereabouts, so neener-neener ;)
Now personally, I see an extensionless URL, my first impulse is to tell it to get back into the server and put some clothes on. But then, I don't like the idea of every URL having to be explicitly rewritten every time or it won't work. I've compromised by letting directories end in / even though that too calls for a rewrite. Only difference is, you don't have to code it yourself.
People would also need to use voice to cite URLs. Suppose I am talking to someone on phone and that person is over a Laptop.
Dictating an URL over the telephone is a task not to be undertaken lightly. Pop it in an e-mail instead. Especially, ahem, if the person is already in front of a computer.
Remember when TV commercials first started including www addresses and they always always always said "backslash"? OK, so that's http:\\www.example.com\stuff\morestuff ... and you wonder why their site doesn't get any visitors.
And, er, yes, I did do a double-take at Pen Island. Ouch.