There's lots of cool things to do with a jailbroken iPhone that you can't do with a shackled iPhone. Like, having a useful lock screen with calendar information. Or, a fancy overlay with easy access to often-used settings (turning on wifi/data/3G and such on a per-need basis saves boatloads of battery life). Or, a notification system that works pretty much like Android's (i.e., is actually useful). And so much more.
We can add something new to the list, even though this one does require a bit more of a walk-on-the-wild-side kind of approach. Flash 10.1 had already been ported to the iPad by Comex, and now, Grant Pannell has compiled the resulting code to work on just about any modern i-device - as long as it's an armv7 (in other words, the iPhone 3GS, iPod Touch 3G, iPad and the iPhone 4). You'll need at least iOS 4 on the iPhone, and iOS 3.2.x on the iPad.
The code in question, called Frash, isn't available through Cydia just yet, mostly because we're talking alpha code here (it's at version 0.02). This means you'll have to place the .deb package on your i-device manually and install it from there. Grant Pannell also provides detailed build instructions.
So, how is this possible? Isn't Flash closed-source? It indeed is, but famous iOS hacker Comex (of Spirit fame) got clever: he wrote a compatibility layer for the Android 2.2 version of Flash 10.1, allowing it to run on the iOS. Of course, there's a copyright issue involved with obtaining the Android version of
libflashplayer.so, so be advised - although I don't think Adobe will be too peeved over this. In fact, I think they're laughing their bums off.
When it's all done and working, it actually works remarkably well, as the guys over at RedmondPie found out.
Of course, be advised that this is alpha-quality code, and as such, is not to be trusted in any way.