Available for about three months now, the iBook (Dual USB) I/O Ports Cap has been designed to cover the data ports installed on the left hand side of iBook systems released in 2001. Made from translucent silicone rubber, the strip helps protect your iBook’s I/O ports from being contaminated by gunk at the bottom of your backpack or computer carrying case.
MacImports.com sells the iBook (Dual USB) I/O Ports Cap for US$18 including shipping. More details are available from the WEb site.