Simple way? Depends on your skill level.
All you need to do is install the Android SDK, root your phone, grab the apk, and put it somewhere else.
In practice, this is roughly:
- Download and install Android SDK
- This installs the Android drivers...
- And ADB, which is a command line program for accessing the Android system.
- Download, install and run SuperOneClick
- This is an auto-rooting program
- And ADB, which is a command line program for accessing the Android system.
- You can now use SuperUser mode to grab the apps. Either install RootExplorer and do it that way, or...
- ADB shell
- su
- cd /system/app
- ls (or dir) - find the actual apk name
- (In another command prompt) ADB PULL (full dir and apk name)
- Sideload (copy via USB, install via FileExpert or similar)
It sounds worse than it is, and it lets you grab a lot of other stuff from the market too. My phone is rooted, and I can simply use RootExplorer to grab th apks, but I usually use ADB PULL because it's pretty one-step for me; I'm accustomed to living at that command prompt.