AvantGo offers a free memory upgrade (https://my.avantgo.com/account/reregister_form1.html) to everyone who registered with AvantGo prior to January 1, 2004. This upgrade allows you to add 1MB of more AvantGo content, at no extra charge

Editor remark: alternatively, you can try using one of the many great alternatives, such as Plucker or iSilo, and get rid of all memory limits.