Business and industrial Wi-Fi has taken off, with the trends in implementation varying greatly over the years. Current technology trends in the corporate wireless world are:
Dramatically increasing the number of Wi-Fi Access Points in an environment, in order to provide redundancy and smaller cells
Designing for wireless voice applications (VoWLAN or WVOIP)
Moving toward 'thin' Access Points, with all of the intelligence housed in a centralized network appliance; relagating individual Access Points to be simply 'dumb' radios
Outdoor applications utilizing true mesh topologies
A proactive, self-managed network that functions as a security gateway, firewall, DHCP server, intrusion detection system, and a myriad of other features not previously considered relavent to a wireless network.