here is the solution for people using blackberry who want to send / recieve sms thru pc and most importantly thru mac  
sadly it is made to work only over bluetooth , so it requires u to have ur bb paired up with ur pc/mac over bluetooth  
if u dont like the idea of using bluetooth , then look elsewhere  
so here it is in simple steps  
the installation involves installing pcsms cod file  
Requirements : u need to have java v1.5 or above installed on ur desktop , if u dont have get it from here http://www.java.com/en / 
A :Pair ur blackberry with ur dekstop  
 
Go into your BlackBerry's Options screen > Bluetooth
Press the BlackBerry (menu) button and choose Add Device (search for a new device)
Once you find your computer select it
It will ask you to put in a pairing key, choose whatever you want (i.e 0000)
Your PC will then ask you to input that same number. Put it in, and you have now paired your BlackBerry with your PC
B: Install SMSLink Onto Your Computer 
     Macintosh :Unzip SMSLink.app.zip into any location on to your computer, and move         SMSLink.app to your Applications folder 
    Windows  :Double click on SMSLinkInstaller.exe and follow the on-screen instructions. When the installation is complete you    will find the application under Start>Programs>SMSLink>SMSLink.exe 
C: installing cod file on blackberry  
     in the attachment there is pscsms .cod which has to be loaded on ur bb 
     to do so just install  blackbbery master control program , go to java commander and just  
     jad/cod tab and browse to cod file and press load , it will reset ur phone and .cod file  
     will  be loaded on ur bb 
  
D: now just open smslink application on ur desktop 
 
Go into your BlackBerry's Options screen > Bluetooth
Select your computer and press the BlackBerry (menu) button to go into the Device Properties
Press the BlackBerry (menu) button and select "Refresh Service List"
Once it is done refreshing, make sure that PCSMS appears in the list.
E: ON ur blackberry  
 
Open up the menu (press the BlackBerry button)
Press the "Start SMSLink" option
it will show connecting , and finally will be connected
 
smslink .rar 
BBMC.zip 
smslinkdesktop old version .rar