[edit: it resolved itself after I quit and reopened the OF on my Mac. I guess it had done something weird and left the database in an unusable state? Strange. I'll leave this up here for others in case it's relevant though.]
Just ran into a snag on my iPod Touch and the Mac. Getting this:
The dav.messagingengine.com server returned "request too large" (413) in response to a request to "PUT [addressremoved]/files/OFsync/OmniFocus.ofocus/20110420190405=mZ0zwHgGHmD.client-write-in-progress-kHAYFFYjalw".
It's been working perfectly for a few weeks now, so this is kind of weird. Other Fastmail DAV users seeing any problems or is this just me?