While living in London, I appreciated the fact that most (all?) wireless operators would text you the phone number and address after a call to information (411 here in the US). This was handy for various reasons - if the number was busy, if I needed to call again the next day, etc. It frustrated me that US carriers (t-mobile and Cingular at least) did not send the information to my mobile, forcing me to write it down or call again if I needed the number once more.
It turns out that Cingular offers this feature if you simply say "Text me" during the reading of the 411 information. Best of all, you can subsequently request that they always send the information via SMS for all future 411 requests.
Pretty neat. Too bad my Motorola Razr does not detect phone numbers in an SMS and enable me to click dial it like my Windows Mobile and Symbian phones did.