One thing that I've learnt today
Is that the distorted collection of numbers and letters that one is often asked for after forgetting your webmail password a few times is called a CAPTCHA ("completely automated public Turing test to tell computers and humans apart"), a kind of reverse-Turing test to prove that you're a human rather than some scumbot trying to dictionary-search your password. Good for preventing automated creation of free email accounts, or blog comment spam for that matter.
But as this fellow proves with his captcha decoder PWNtcha ("Pretend We?re Not a Turing Computer but a Human Antagonist"), there's still a lot of breaking going on for the alphanumeric varieties...
Personally, I'm so paranoid online that I sometimes hide bits and pieces of logins and passwords in amongst various junk-type in a Notepad window before ligating them in the form fields via highlight/copy/pasting...
Which is one reason why I wish I could be shot of my now-redundant BG (before-Gmail) Hotmail accounts. I can't shut them down as - very occasionally - something useful still comes through. But the damn thing doesn't even allow my preferred password (I try to prefix all of my different passwords with a regular 9 character block of alphanumerals).
So there you go. That's what I've learnt today. But I didn't say it was going to be interesting.
27 AUGUST UPDATE: And I now see that Blogger now allows blog-owners to use captcha's for their Comments...