WEP Officially useless
From German researchers put final nail in WEP:
 For an idle network that’s being attacked with packet injection, WEP can fall in an average of 52 seconds for 802.11g or 3.5 minutes with 802.11b. But we have to assume the worst, and the cracking can sometimes happen even faster than the average times I listed. What this means is that WEP (even with dynamic key rotation) is officially broken beyond repair.