Yes, the end of my comment was a (weak) attempt at humor, since there has been quite some talk lately about Google building cars that will drive themselves:

http://www.nytimes.com/2010/10/10/science/10google.html

Edit: actually, all I really wish for, is for allintext: to work all the time. Why would I be a robot if I'm logged in, on an account of a normally active Gmail box?

Also, why is it such a secret? Why not make it more visible? A checkbox on the home page...

Lots of bot queries do allintext: searches, while fewer humans do that query. Bots can hijack human accounts/cookies too. Email spam botnets often use the valid cookie of their owner's host computer.

Fewer humans do that query because it is kept almost secret (why do bots like allintext?)

I wouldn't mind answering a captcha from time to time, but instead Google just bans the use of allintext for several dozen minutes (or more). Really frustrating.

And number-range searches. I can't count how many times I've wound up with a number-range search query that wouldn't work for me from any IP.

So allintext is essentially a honeypot for bots? Otherwise it seems weird to offer the option at all, if all it does is get you banned for being a robot.