Interesting driver.
For other people's benefits:
Rapidshare download link
Thread link
Unfortunately, I cannot test this driver because both my x50v and x51v are using WM6. That has native SDHC support.
From the looks of it, it doesn't even work on some other models of iPaq. So therefore, I would suspect that it wouldn't work on the Axim series.
The problem with it is that you have an iPaq. So even if us Axim users test it, we cannot verify that it works on an iPaq.