I am looking at buying a PCMCIA card to access the 3G network, I have seen the Sierra Aircard 875 but it does not mention 3G capability, is this the case and could you recommend other cards that have 3G?

The Sierra Aircard 875 does have 3G capability and currently can handle speeds of upto 3.6 Mbps on HSDPA networks but it will be able to handle speeds of 7.2 Mbps available through a free ROM upgrade available later this year.