WeFi for Pocket PC 1.0
the author of this app says:
WeFi for Pocket PC is the best software for finding and connecting to wireless networks with your windows mobile device. With WeFi, you always get the optimal WiFi connection, while keeping the battery consumption to a minimum. The WeFi software provides you with an intuitive and aesthetic user interface to manage your WiFi connection and allows you to automatically launch application once such connection is found.