QUOTE(nikady @ May 26 2007, 01:44 PM)

apparently GC comes to mailbox one day "hopefully'.
What if a request for you to come to the local USCIS comes in the mail first instead? If you leave the USA without AP or your Green Card in hand, then how would you get back if there are any problems which require you to visit a USCIS service center?
If you think you want to travel, why not apply for AP now, get it, and then go. If your Green Card comes before your AP is approved, then so much the better.
Why take any chances at this stage?