National Republican leaders unveiled a Web site Friday that they hope will encourage grass-roots participation in the shaping of the party's 2008 platform. Republican leaders say they think the site, www.gopplatform2008.com, will create an online community allowing anyone with access to a computer to offer ideas, to comment on others' ideas, and submit videos about their views. "I feel certain we'll get some great ideas," said Sen. Richard Burr, R-N.C., co-chairman of the Republican platform committee. "Will that be the majority? I have no way of gauging."