Check out the BUG open source hardware/software platform. It would let you do something like this.
http://buglabs.net/

My exposure to ext4 is so far limited to running it on a VM running Ubuntu 9.04 since a few months prior to its April, '09 release. I've noticed improved disk I/O performance, and have experienced no data loss. I'm considering running it on some non-critical production systems, but that's beside my point, which I didn't make clear, so I'll try to do so now:

Before doing something as extreme as running a newly released filesystem on a not-yet-released distro, I read the distro's release notes to know what the issues and risks were. After doing this with Ubuntu 9.04 beta, I was expecting the possibility of data loss with ext4, so took appropriate steps (set up regular backups, etc.) As a distro test pilot, I packed a parachute (backups), and expected to use it.

Making a statement today (post- Ted's fix, which has been applied to the Ubuntu 9.04 Linux kernel) such as "I lost data for the first time while running ext4 on Ubuntu (pre-fix)" is unfair and misleading. The question being posed is "is ext4 stable for production systems (implied: "now", and assuming: "in a released Linux distro")?", not "was it stable for production systems a few months ago, in a beta distro release?".

If people are only concerned with a single technical issue, and that issue has been resolved with a fix from the project maintainer, then we need to be asking questions more like, "Was this the right fix?", then: "Has ext4 been properly vetted, and is therefore trustworthy enough for production systems?", and "If not yet, then when?".

There's no such thing as Ubuntu 9.01. I'm assuming you mean Ubuntu 9.04 (aka. "Jaunty"). If you installed that a few months ago, you installed it while it was still in pre-release status. It also uses ext3 by default, not ext4. See http://www.ubuntu.com/testing/jaunty/beta#Ext4%20filesystem%20support . where the Ubuntu team says "Ubuntu 9.04 Beta supports the option of installing the new ext4 file system. ext3 will remain the default filesystem for Jaunty, and we will consider ext4 as the default for the next release based on user feedback. There has been extensive discussion about the reliability of applications running on ext4 in the face of sudden system outages. Applications that use the conventional approach of writing data to a temporary file and renaming it to its final location will have their reliability expectations met in Ubuntu 9.04 beta; further discussion is ongoing in the kernel community."