Erik pointed me to a Pocket PC Thoughts article yesterday that mentioned a new ROM update. I downloaded the new ROM from Dell’s support page, saved my originial ROM, and updated to the new one. It looks like just a minor update:
Enhance your PDA with wireless security feature. (The enhancement is only for 624MHz & 312MHz integrated Wi-Fi, Bluetooth model)
Enhance SDIO bus driver.
At first glance my wireless connection (using WPA) seems to be a bit more stable, but I haven’t been using it long enough to tell for sure. Nothing broke, though I had to re-sync my data and still have to re-install some programs.