It seems almost too good to be true, but it looks like the era of usable Gmail integration on BlackBerry might finally be upon us. CrackBerry is citing information that BIS 3.0 will be rolled out to North American customers in the wee hours of Sunday, March 28, when most of us are in a peaceful slumber (a good thing, considering that data services will be mostly down during the four-hour window). Out of the gate, 3.0 will offer Gmail label creation and deletion when using the plug-in along with support for OpenDocument file types and WMA audio, but the real meat should come shortly thereafter as two-way synchronization of read status and sent messages "will be added throughout the Spring 2010 by region." Technically, Spring starts today, so this could show up the moment BIS 3.0 goes live -- but given that we've waited literally years for this to happen, we're not getting our hopes up prematurely.