No.
Not as of firmware 1.1.4. Though recent updates saw an extension of the iPhone's VPN protocol support, LEAP/PEAP WiFi support was absent.
LEAP/PEAP support, along with many other features, is rumored to be coming with the iPhone 2.0 release but this has not yet been confirmed.
While there's no official support for this feature from Apple at this point, iPhone hackers have developed a method to enable EDGE data sharing via a SOCKS proxy server and WiFi.
It's important to understand the implications of hacking your iPhone, like all unapproved iPhone activities, be sure to carefully research the process before implementing it.
For more information, read the post Hacked iPhone Tethers EDGE data over WiFi.
