Camera phone lens

[webley445]

I saw on ebay removeable lens for use on camera phones. Has some type of sticky o-ring type deal and you just press it over the original lens.
Gives a more wide angle effect.
Anyone else seen these or used one? Am wondering how well if at all they work.

http://cgi.ebay.com/Wide-Conversion...7QQihZ005QQcategoryZ41313QQrdZ1QQcmdZViewItem