All organizations face security risks, and you have to tolerate some level of risk to stay in business. Wireless comes with its vulnerabilities, but that doesn't justify banning it because there's a chance a hacker could tap into your network from the parking lot. Instead, consider both the risk and the cost of adding additional layers of security.
Say you decide to install an insecure WLAN outside your firewall, for example, requiring VPN or Web-based authentication for access to internal applications. That may expose your organization to someone who's connecting to your WLAN to surf the Internet for free, but that's probably not a risk that keeps your CFO awake at night. The applications remain safely tucked behind the firewall.
Then again, you could implement multilayer WLAN security, which could double the price tag of your deployment. Depending on your budget, that could kill the wireless project altogether.
6. Waiting too long to go wireless
WLAN technology has become a tremendous retail success, with overall sales in the consumer market now exceeding those in the business market. Once your employees have wireless access at home or at their local Starbucks, they'll want it at the office, too.