Send SMS through EMail..

SMS through E-Mail: Cingular, Nextel, Sprint, T-Mobile, Verizon, Virgin Mobile

T-Mobile:phonenumber@tmomail.net
Virgin Mobile:phonenumber@vmobl.com
Cingular:phonenumber@cingularme.com
Sprint:phonenumber@messaging.sprintpcs.com
Verizon: phonenumber@vtext.com
Nextel: phonenumber@messaging.nextel.com

where phonenumber = your 10 digit phone number

Or use:
http://teleflip.com/services/servicesmain.htm