Apple posted OS X 10.5.5 update. Looking at the release notes there are a few improvements targeting the iPhone, including:
- Improves iPhone sync reliability with iCal and Address Book.
- Improved Wiki, Blog and Podcast compatibility with Safari and iTunes on iPhone and iPod Touch.
- Time Machine can now back up iPhone backups that are on your Mac, as well as other items in (~/Library/Application Support).
Links to the release notes: