Ok guys, I found a solution to this problem.
I got a Macbook Pro (mid 2010) and I have recently bought an OLICARD 145 wireless pendrive (Tim branded).
As I upgraded from Snow Leopard to OSX Lion I noticed the OLICARD 145 pendrive wasnt recognized anymore.
The issue is that TIM provides us with just 32bit drivers, so OSX Lion (pure 64bit system) wont recognize the pen unless you reboot in 32bit mode (Restart your macbook and hold keys '3' and '2' together).
What I did to make everything work was simply this:
1) reinstalling the drivers under 32bit kernel (hold down 3 and 2 together while restarting the system), restarting once again after the drivers installation is over in 32bit mode (the pendrive installation procedure requires to do so);
2) open the connection manager provided by TIM (for italian software its called 'Chiavetta Internet Olicard 145').
3) once opened, the connection manager will display that "initialization in progress.." but you will notice that this message gets stuck there.
4) now, leave connection manager open AND open your macbook's Network settings window, locate 'JRDMODEM2' in the network devices, click on it, fill the field on the right "Phone number" with *99# and click Connect.
5) You will be connected..and thats it.
Hope that helps you a little.. ciao!