You might think Web surfers have started to wise up to Internet rip-offs. But you'd be wrong. Here's how scammers are trying to dupe you today. After years of trying to recover from the dot-com hangover, the Internet is booming again. Online retail sales increased by 26 percent in 2004, according to comScore Networks. In September 2004, the number of domain name registrations hit 64.5 million--an all-time high. You know what else is on the rise? Internet crime. Complaints about online fraud nea…