Bellevue-based Motricity, the mobile data services firm, said this morning that Ryan Wuerch, the firm's CEO, has left the company. According to the company, the firm and Wuerch mutually agree to terminate his employment with Motricity. Reason for the departure was not given. Motricity said that Jim Smith has been named interim CEO, and that it has engaged Korn/Ferry International on a search for a new, permanent CEO.