So, I’ve had a ton of fun installing various packages, apps, games, and other utilities on my iPhone thanks to NullRiver http://iphone.nullriver.com:16080/beta/
This application adds an installer button to your switchboard. After its installed you can download packages and various other things for the phone. One of the coolest mods Ive seen is called SummerBoard which lets you scrolling SwitchBoard icons because I now have added about 10 applications to the phone and there is only room for 4 more by default. There are also a ton of themes available for download. My iPhone now runs Apache web server and PHP. It’s amazing to think I can SSH into my phone, or SSH into another server from my phone. I’ve got some really good NES games too. Packages seem to be updated daily and there are new ones available all the time. I would suggest anyone with an iPhone to download the application from Null River. It’s well worth it.