Dreampipe supports a good list of Dreamcast games with built-in web browsing. With many more to be added once they can be tested. Some of these games include

• Crazy Taxi 2
• Sega GT
• Metropolis Street Racer
• Sonic Adventure
• Sonic Adventure 2
• Phantasy Star Online
• Ferrari F355 Challenge

Many others still need to be tested. Use 192.185.5.88 as DNS2 to use any of those, and more. Info here

This feature is still a work in progress