WiFi Checker 2.1
WiFi Checker for iPhone (Formerly WiFinder) – Quickly discover local open, and not redirected wireless networks!
Drill down to connect and view additional access point configuration details, or turn on auto-scan to continuously search and buzz you when free WiFi is found.
Compatible with iPhone and iPod Touch.
Requires: iPhone OS 2.2 or later. A new update for OS 3.0 is under review.
Download: WiFi Checker for iPhone 2.1