I have a calendar in iCal that is stored (published) on Box.net servers (which support webDAV)
my iPod touch used to be able to write to the server and the changes would show up in my iCal application on my mac
however, after this 2.0 upgrade I can make a change in the touch iCal app but it won't write that change to the .ics file stored on Box.net's server
does the iphone/touch iCal app not write to a server now? (I doubt box.net changed their service)