If you would like to add your static repository just issue an initiate request:
http://imlsdcc.grainger.uiuc.edu/gateway.net/oai.aspx?initiate=your_static_url_goes _here
The gateway will validate your repository and email you with some confirmation instructions. For details on how initiate works refer to the OAI Static Repository specification:
http://www.openarchives.org/OAI/2.0/guidelines-static-repository.htm#SR_initiating
Also for anyone who would like to host their own OAI Static Gateway Service the code is open source and can be downloaded from the UIUC OAI Metadata Harvesting Project SourceForge site. The code is available from the SourceForge SVN or as a ZIP file:
http://sourceforge.net/project/showfiles.php?group_id=47963&package_id=256028