If you've recently jailbroken your iPhone (and if you haven't, here's a hassle-free method), you might be bewildered by the choice of available third-party applications--particularly because the app's individual info screens while browsing aren't often very informative. Some application names such as "iSolitaire" make it pretty easy to guess at their function, but what about names like "VT100" or "Simplify"?
If you're wondering where to get started on making your jailbroken iPhone more productive and entertaining, here are some of my top favorite apps in no particular order:
1) Summerboard--Summerboard is a themer for your iPhone. While it's not a productivity app, the ability to change the look and feel of your iPhone's interface (example pictured right) can't be underestimated. You'll need to install the Summerboard package itself first--found in Installer under "System"--which will add an icon to your phone called "SMBPref". Now you're ready to install new themes in Installer's "Themes (Summerboard)" menu. Simply install it and use SMBPref to select your theme as the active theme. If you want to use your own wallpaper, remember to turn the theme's wallpaper off in SMBPref.
2) MobileFinder--This is a simple app that will let you view files and filetrees on your iPhone. It doesn't sound like much, but it provides a crucial link between external applications like iPhoneList, that let you drag and drop files to your phone, and third-party phone apps like TextEdit or WildEyes that can use the transferred files. It will let you browse, modify, and create folders as well as copy, move, or delete files. For powerusers, it will also provide extensive metadata on individual files and let you set their access permissions and the default programs to open them.
3) Simplify--Stream your music and video from your home PC to anywhere you're near WiFi access. You'll need to have the Simplify software installed on your home computer (it's free--learn more and download here), but once that's set up you can sign in from the Simplify icon on your iPhone to listen to all of your digital music wherever you are. Not only that, but you can invite and be invited to friend's accounts, giving you streaming access to their media as well. Which means that as long as you have a WiFi connection, you're not limited to 8 GB of media storage--now it's virtually infinite.
Brief aside: Hopefully, the 3G iPhone dropping in June will be able to pull the kind of data rates that won't require you to have WiFi access to stream your shared media, meaning you'll be able to have practically unlimited media everywhere you go. (Of course, someone will have to figure out how to jailbreak it first.) Imagine connecting your iPhone to the auxiliary jack on your car stereo and streaming your home playlist to your car with no configuration needed! Pretty cool if iPhone hackers can get that working.
4) Books--an eBook reader that reads simple HTML and text files, and will automatically parse chapters into subdirectories for easy browsing. Simple, fast, and with a growing repository of downloadable books you can get via Installer--or add your own using an external program such as iPhoneList.
5) WildEyes--WildEyes for Safari is pretty much your one-stop shop for viewing virtually any kind of document: Adobe .pdfs, Excel spreadsheets, Microsoft Word documents and more (that you've transferred to your iPhone using a program such as iPhoneList) are easily browsable via a simple menu and will launch for viewing in a Safari browser window. Files can't be edited, though--for that you may want to use the iPhone-optimized interface for GoogleDocs--but its speed and multiformat compatibility make it a must if you use your iPhone for any business-related purposes.
(Read about 5 more great iPhone apps after the cut.)