There is a new version of PocketMac (free) for Blackberry. Version 4.0 is a significant improvement and now works with many other calendar and other applications as well as having numerous new features. Still no syncing over BlueTooth (i.e. needs a USB connection) but you can push your Safari Bookmarks to the device and loading new software is made easier. You can also sync to your .Mac account and sync emails you've sent fromt he device to your Mac.
It's also compatible with the new Pearl Blackberry. Very nice software. Only caveat is that if your user account does not have admin priviledges, you must activate them before installing and then disable after (I usually work from a non-admin account for security reasons - its much safer). You cannot install into an administrator account and then use PockMac from a non-admin account. You can turn off admin priviledges for the user account after installation. It's do do with access settings. You also need OS X 10.3.9 or 10.4.x It doesn't work with some of the older "Berries.
It's also compatible with the new Pearl Blackberry. Very nice software. Only caveat is that if your user account does not have admin priviledges, you must activate them before installing and then disable after (I usually work from a non-admin account for security reasons - its much safer). You cannot install into an administrator account and then use PockMac from a non-admin account. You can turn off admin priviledges for the user account after installation. It's do do with access settings. You also need OS X 10.3.9 or 10.4.x It doesn't work with some of the older "Berries.