From your BlackBerry's Home Screen look for the new Google Sync icon (Yin-and-Yang stylized arrows embracing the letter "g"). A status screen summarizes the last time your calendar and contacts were successfully synchronized between Google's cloud and your BlackBerry. On a monthly basis, data usage is displayed in kb - an especially important metric for those on anything other than unlimited data plans!
While the Google Sync client is open, you can use the Menu button on your BlackBerry to explore the options.
Under "Options", you will be presented with the client's configuration options:
Synchronization frequency - Locate the "When To Sync" configuration option. Note that you can have synchronizations take place when you demand them ("Manual") or on your behalf ("Automatic"). If you opt for automatic synchronization, Google Sync will be enabled soon after modifications are made to your calendar or contacts.
Contact synchronization - This is the highly coveted functionality I introduced at the outset. As of this version of the Google Sync client, contact synchronization is either enabled or not enabled. There are no other configuration options.
Calendar synchronization - Google Sync has had this capability for some time. Therefore, it is not surprising that this more-mature functionality has a few configuration options available. In addition to the option to enable calendar synchronization, the Google Sync client accounts for past and future events. For example, you can retain events for the 1, 2 or 4 weeks just past, and synchronize forward in time for periods of 4, 8, 16 or 24 weeks. Before you get too carried away though, keep in mind that the more data you synchronize the less free memory your BlackBerry will have. Finally, you can choose to synchronize alarms and even multiple calendars.
The "Sync Now" option is selected by default. If you select it, note that you will need to allow for encrypted communications between your BlackBerry and Google's cloud. You will need to allow the connections for the client to communicate on your behalf. One word of caution is in order: First-time through, it may take Google Sync some time to perform the synchronization. You can help it along by choosing to synchronize only your contacts or only your calendar and in the latter case, keeping the past/future event requirement to the bare minimum. Once this initial synchronization has taken place, I expect you will find Google Sync quite unobtrusive, as it will be only the differences in your calendar and contacts that will require synchronization - and as noted earlier, these differences will be synchronized more-or-less as they happen (and/or when you demand them).
Of course all of this presupposes you have a Google account ... and that you know it - as you will be expected to log in as necessary.