I am also facing the similar issue. I do not think it is the fault with the USPS, but from our postal department.
Even though the USPS tracking site says that it has cleared the foreign (India) customs on the 29th March 2010, am still waiting the parcel to be delivered.
Mean while I enquired with the local (Kochi) foreign post office, where I was told that the parcel (which is a Blackberry) might be detained by the customs for checking and that I might receive the memo to be present at their office in may be 10 days time.
Today being a 2nd saturday, thats all the foreign post office people could help me out.
Am also waiting.....