I am not sure if others are experiencing this, but after the recent February firmware pushed to users by Eye-Fi Inc., our photo uploads have started to fail: “Receive interrupted” are the frequent error messages. It looks they introduced something called “smart boost” in this upgrade, maybe that is the culprit. It appears to use your PC as some kind of cache, and since the Eye-Fi Manager software here is installed to a Vista machine, there might be compatibility issue. Dunno — weird they broke the product/service.
Edit (Feb 8, 2008): I have reached the helpdesk of Eye-Fi and continue to look into the source of this issue. My current suspect is that the new firmware does something a bit differently, in a manner that disagrees particularly with the DD-WRT firmware that I am using in my LinkSys WRT54G router (a Linux based, open source project). Currently with the Fonero Wi-Fi router I am able to reach much more reliable results. Will continue trying and testing… (Btw, if you are interested in tweaking DD-WRT, check out this post: http://lifehacker.com/software/router/hack-attack-turn-your-60-router-into-a-600-router-178132.php.)