Not a daft question at all.
You would get some increase in speed if you use a compatible router and card for the highspeed 802.11 g wireless standard. If you don't have a router that supports high speed then just getting a 108 card wouldn't help.
If you are thinking of buying a new router and card then look at the 802.11 n standard which is supported by most of the bigger router manufacturers now, although the standard is described as "draft". Look for a router that supports a higher speed over the distance you typically use between laptop and router and the drop off in speed is a factor of transmission power/distance.
In all cases the speed is a nominal figure and you are unlikely to get anything like that under real conditions but clearly the faster the top speed supported the higher speed you will get.