Long Islanders are logging on to the Web Monday, hoping to cash in on special bargains and promotions.The day, known as Cyber Monday, marks online retailers' ceremonial kickoff for the holiday shopping season. The National Retail Federation has its own Web site, www.cybermonday.com, that includes a list of special promotions. The Web site has deals of the hour, highlighting special offers from different online retailers. There are also links to various retailers that are offering free shipping, regardless of how much is spent.A National Retail Federation survey found that more than 172 million shoppers went to stores or visited Web sites since Black Friday, up from 147 million shoppers in 2007.CyberMonday.comUPromise.comShop.org