Luis let me know about this cool website/service called TrackThis. It simply lets you know with nearly instant updates where you package is. It can send updates over email, RSS, SMS, Twitter and Facebook (app required).
Pretty cool if I have to say so myself. And it covers UPS, FedEx, USPS, DHL, and a few other carriers. They do not have a mobile version of their site, but it looks and works fine on my Bold.
Check it out at www.usetrackthis.com