I noticed the problem of wireless network drops with my MacBook Pro. After some investigation I found that the issue was not with the MacBook Pro, but with the channel I was using on my wireless router. Using a program like KisMAC I was able to scan for all other wireless APs within range of my wireless AP and saw that I was using a channel that many others were using. Certainly this causes interference, so I switched to a channel that none or very few are using. The problem ceased. Using the "Interference Robustness" option can help in these situations to a certain degree by sacrificing throughput for error correction. However, these days the population of wireless APs is quite dense and interference is a growing problem. Also one should research that channels do not overlap frequencies with each other or other devices. Some wireless router channels do overlap frequencies to different degrees even-though the "channel numbers" are different.