Yes, that's what a wireless router is. The Linksys wireless router and SMC Barricade as examples of such. A wireless access point on the other hand only supports the wireless NICs.
I missed this thread the first time around, and I have to disagree with the recommendation of the Linksys NIC. The Linksys NIC is not very good. I unfortunately used one for 1 year on the belief that all wireless NICs are all the same, as it's often said in forums, until my brother-in-law bought one because that's what I had and I said I never had problems with it, and he complained about range and speed. I then bought a Netgear and an IBM (Lucent rebadge) and tested them against our two Linksys NICs (purchased about 1 year apart). I tested them at 3 distances--6ft from the AP, 20ft with furniture in between, and 50ft with a wall and furniture in between--by transferring a 15MB file 3-5 times for each distance/card. I only do an extra 2 transfers if the transfer times varied significantly in the first 3 transfers. The AP is a SMC Barricade. I use the same notebook and the same server for the transfers.
I don't have the exact data on hand, but the IBM (Lucent) had the same throughput in all 3 ranges. Transfer time without WEP was under 30 seconds--all within 1 second of each other. With 64-bit WEP, transfer times increased by a third, to 40 seconds, but they were also consistent in all ranges.
The Netgear had about the same results as the IBM at the two shorter ranges. However, at the longest range, the transfer times were inconsistent. Sometimes it would take the same time as the IBM, others it would take a lot longer (20%-50% more time). I don't believe I got 3 results out of 5 that were within 2 seconds of each other. This is with WEP enabled and disabled.
The Linksis was also consistent only at the two shorter ranges. However, it was slower than the Netgear and the IBM by about 4 seconds with WEP enabled and disabled. Transfer times increased at the 50ft obstructed range. The Netgear, even though inconsistent, at least was able to match the transfer times at the shortest distance a couple of times. The Linksis couldn't. In one of the transfers with WEB disabled, the transfer time was double what it was at the shortest range. The numbers were slightly different for the two Linksys NICs but the result is the same.