On the Apple Discussion forums it's been well reported that all C2D iMacs suffer wireless problems and have extremely low transfer rates (lower than even 802.11b). I have a C2D iMac and I use a wire but I tested the wireless on my 802.11g network to investigate and mine too suffers these problems. A CD MacBook Pro connecting right beside the iMac runs at full 802.11g speed, so it must be the iMac. As the new C2D MBPs have the same chipset, and the same wireless card, as the C2D iMac, it seems very likely they will suffer from terrible wireless speeds too. I don't mind the problem too much on my iMac since it's always wired but I have a C2D MBP arriving on the 6th and I'd obviously hate if it has the same problem as it will be used wirelessy nearly all the time. Can someone who has already received their new MBP and has an 802.11g network please test? If the MBP suffers the problem you'll likely end up with a transfer speed of around 500KB/s (which is half a meg a second). If it works properly 802.11g should be delivering at least 2000KB/s.