Until we get something that will work with the baseband 5.14.02 if your waiting for the unlock. Just wanted to remind folks. It's been confirmed by engadget that it will be dropping today, so I just wanted to caution people to wait a few more days.. We've waited this long, whats a few days going to hurt?
Once PwnageTool & redsn0w are updated, then currently unlocked iPhones will be able to safely upgrade to the latest version via custom firmware. Keep an eye out on the iPhone Dev Team Blog.