If you're on the road and you need an ADB prompt to interact with your phone, many people will be lost as to what to do. It's kind of hard to carry the Android SDK on a flash drive, and if you're doing that solely for an ADB prompt, then it's kind of useless.
Basically, I've packaged an ADB prompt into a portable package for debuggers, hackers, and others to carry on the road. It fits on a small USB drive, and can even sit on your phone's SD card slot, ready to use.
You don't need a working copy of the Android SDK to use it. I've tested this on several computers, with and without the SDK on them.
So far a Windows-only copy is working fully. I haven't started on a Linux repackage, and perobably won't do a Mac port (unless a Mac owner/user is willing to).
All you need to do is extract the package, run adbprompt.bat, and you're good to go!
I'm sure this is stable enough for everyday use. Although seeing as I haven't explored every single facet of ADB on this portable package, I can't be too sure. It's labeled as a BETA until I've confirmed its stability.
Download link is below.