Banner 4 .com is the premier Banner Exchange site. By displaying ads on their web site, banner4.com members generate free advertising and site-linking for their own site.  Banner 4.com members earn 3 displays of their banner for every 4 banners they display.

http://www.banner4.com

Silicon Wall is a wholly owned subsidiary of Argen Corporation,  a publicly held, Global Internet operating and development company investing in a network of established and emerging companies spanning a range of vertical market segments including infrastructure and enabling technologies; e-business, interactive marketing, advertising, Internet professional services and portals. Argen leverages the technology, content, and market reach of its extended network to foster rapid growth and industry leadership across the Internet Economy

http://www.siliconwall.com