We just published a "request access code" button for first-time visitors to the MCP site who have lost their access code or it expired. The access code (you get it in an e-mail after passing a MSFT cert exam for the first time) is only good for a few weeks so I know a lot of people just don't get to it in time. You'll get the opportunity to request a new access code while you're associating your MCP ID with your Passport/Windows Live ID. If you want to give it a try: http://www.microsoft.com/learning/mcp/passport/instructions.asp
Let me know if it works for you, or you have suggestions on how to make it better.
If you're wondering why you'd need to get to the MCP site - it is where exam transcripts, certification logos, and transcript sharing tools are found...
Here's the bit about the self-help button:
§ This service is for first-time visitors to the MCP site.
§ Before you request a new code, confirm that your spam blocker will allow e-mail from firstname.lastname@example.org
§ If you have already associated your MCP ID to your Windows Live (or Passport) ID but can not remember your password, or if you have any other site access issues, you will need to contact your Regional Service Center for help.
§ MCP site access steps: http://www.microsoft.com/learning/mcp/passport/instructions.asp