Possible virus in Cydia
It is reported today that Cydia could be affected by a virus. The package "snes4iphone" in the repository "zottd" may contain malicious code. The package would not lead to serious damage, but executes a script that installs an advertisement in all the html pages of Cydia, including the initial one.
If any of you thisnk your Cydia is affected, simply reinstall it via this route:
“Manage” -> “Package” -> “Cydia Installer” -> “Modify” -> “Reinstall”