BORDER WAIT INFO:

Good news for travelers between the U. S. and Rocky Point.
During busy times and holidays, the border has opened up additional lanes, making your crossing quicker. 

Visit this link for border wait times for
US-Canada and US-Mexico border:

http://apps.cbp.gov/bwt/

We found this website recently. It offers fast service for passports:

http://www.passportvisasexpress.com/index.xml

I don't know this company personally, but I did use a service like this when I received word that I needed to go to India and I had 1 week to get my passport updated and obtain an India Visa. The company performed as they promised.
Robin Miller...this website's administrator.

PASSPORTS REQUIRED

You can still cross back through the U.S. border with a picture ID and  proof of citizenship such as a Birth Certificate, but plan on a little more time to cross as they confirm your status.

http://travel.state.gov/passport/passport_1738.html

Current rules on Passport Travel
The following summarizes information available on the Department of Homeland Security’s website.

LAND AND SEA TRAVEL

• CURRENTLY: 
  U.S. citizens need to present either (a) a passport, passport card (available in spring 2008), or WHTI-compliant document; or (b) a government-issued photo ID, such as a driver’s license, along with proof of citizenship, such as a birth certificate.
• LATER:
  On June 1, 2009, the U.S. government will implement the full requirements of the land and sea phase of WHTI.  The proposed rules require most U.S. citizens entering the United States at sea or land ports of entry to have a passport, passport card, or WHTI-compliant document. 

Note: The passport requirement does NOT apply to U.S. citizens traveling to or returning directly from a U.S. territory.

U.S. PASSPORT AND WHTI COMPLIANT DOCUMENTS: 

• U.S. Passport: U.S. citizens may present a valid U.S. passport when traveling via air, land or sea between the U.S. and the aforementioned Western Hemisphere countries.
• The Passport Card: Passport card applications are currently being accepted in anticipation of land border travel document requirements. Based on current projections, we expect to begin production of the passport card in June, and be in full production in July. We will provide additional updates as available. Once in production, the passport card it will only be valid for land and sea travel between the U.S. and Canada, Mexico, the Caribbean region, and Bermuda.
• WHTI-Compliant Travel Documents for U.S. citizen travel via land or sea, as of January 31, 2008:
• • Trusted Traveler Cards (NEXUS, SENTRI, or FAST)
  • State Issued Enhanced Driver’s License (when available)
  • Enhanced Tribal Cards (when available)
  • U.S. Military Identification with Military Travel Orders
  • U.S. Merchant Mariner Document when traveling in conjunction with official maritime business
  • Native American Tribal Photo Identification Card
  • Form I-872 American Indian Card

For further information see U.S. Customs and Border protection. 

Main government passport info website:
http://travel.state.gov/travel/cbpmc/cbpmc_2223.html