SMS
It seems everyone has text messaging as part of their cell phone plans. And the younger you are, the more likely you are to text. A lot. But SMS has grown to be more than just passing snippets back and forth. People have used SMS do so much more.
Here are liks to websites with SMS text messaging services. SMS and voicemail, SMS and groups, SMS and email. Take your pick.
Google Calendar & Twitter via SMS :: knitting Google Calendar and Twitter together using SMS as the medium
Yahoo! OneConnect :: iPhone users rejoiceUmbrella Today? :: localized weather
Domains by Text :: "Is this URL available?"
Quicken Beam :: leave it to Intuit
reQall :: lists, organization, & reminders
drop.io :: upload/publish tidbits online
BitPim :: Manage data on CDMA phones from LG, Samsung, Sanyo & others
AIM = free SMS :: (sidestep text message charges)
MyGADs :: publish & retrieve your own data online
3jam :: a free text message inbox on the web
Diet.com mobile :: query restaurant foods online
Amazon TextBuyIt :: shop on Amazon.com using your mobile phone
Treasuremytext :: archive your SMS messages
TrackMyShipments :: real-time package tracking
New York Times mobile :: NYT on your phone
Web-Alerts.com :: text alerts for your favorite web sites
Read about using the Special Information Tone. Special Information Tone, signal for "vacant circuit" (out of service or nonexistent phone number), on Wikipedia.
More info on text messaging can be found on wikiHow.
