I use google to sync my mobile contacts, tasks, calendar etc from my windows mobile.
While sync’ing with the site, it stops with an annoying support code 0x80004005 😦 http://jlvillaraza.spaces.live.com/blog/cns!BDFB7845C22E26B6!1662.entry was helpful in this. Uncheck all items like email, task etc except Contacts. Sync contacts first. then continue with other items one by one. It worked finally.
By the way, who is the killer here, windows or the google? 😉