Cell service in the EU

I know many of you folks are from EU member countries. I am going to be in Poland, Italy, France, Switzerland, Sweden, Germany, and Slovenia in October. I need to get a cell phone while I am there to keep in touch with the office. Does anyone have a recommendation as to who a good cell company is in the EU? Also, are there any companies that also offer wireless internet service? (Like a cellular PCMCIA card.)

Check if your service provider has partners in the EU. They should have.
Also check to see if your phone supports GSM 900 and GSM 1800 (triple band).
I believe you yanks are on GSM 1900 while GSM 900 and GSM 1800 are used in the rest of the world.

If your phone can do EDGE or UMTS you should be able to use it as a (DSL) modem for your laptop or surf the net directly from your phone.