Yep, you read that right. In fact, Google assures us as such, saying "Yes, really." Actually, all of the Google Apps suite — comprising Gmail, Google Calendar, Google Docs and Google Talk — is having the beta label removed.
Mainly it looks like this is being done to eliminate confusion over what "beta" really means, and to make Google Apps more attractive to businesses. From the Official Google Blog:
We've come to appreciate that the beta tag just doesn't fit for large enterprises that aren't keen to run their business on software that sounds like it's still in the trial phase. So we've focused our efforts on reaching our high bar for taking products out of beta, and all the applications in the Apps suite have now met that mark.
For our purposes, what we really, really want to see is better implementation of Gmail on Windows Mobile — push, IMAP idle and the like. (Oh, and maybe do something about those contacts.) Yeah, we've been saying that for a long time. But either Google or Microsoft needs to get it done. After all, now that Gmail's "out of beta," there are no more excuses.