There is a new version of Installous 2.5. With installous you can easily search through hundreds of cracked AppStore apps then download and install them with a single click! This version of installous is work under OS 3.1.2 (3.x I think).

I can’t find any sufficient change in it’s interface but I think that this version is more stable than previous version.
In order to install it you have to add the following repository on your Cydia:
http://cydia.hackulos.us