Tell My Mile Marker whenever you fill up your vehicle with gas, answer a few simple questions, and they’ll track your fuel economy. Enter data right from your phone using their mobile interface or Twitter bot.  Thanks, Sandy.

Send a street address to the bot, and it will return the location of the nearest FON wireless LAN hotspot, a free WiFi community. Example: ‘d fonf jay st, new york, us‘.

Need to remember something? Send timer a direct message, and it’ll tweet you back. For example, ‘d timer 45 call mom‘ reminds you to phone the lady who brought you into this world, in 45 minutes. Additional information on timer can be found here.

Send a direct message to twittersearch with a search query (Example: d twittersearch foo). You’ll get a direct message back from Dave Troy’s wonderful Twitter Search hack with the last public update matching your search query.

Direct quote from its description: “Listen up, human. I can give you sports news, scores, and TV listings. Friend me, then message me ‘help’ for instructions. Robot Power.”