I've found this helps quite a bit as it allows me to pull up quick contacts (my primary way to dial), luna manager (for a quick luna restart as opposed to rebooting which takes forever), or bringing up the terminal (for troubleshooting) in the case of a low memory / throw cards away situation.

Edit /etc/palm/luna.conf

There is a parameter called AppsToAllowInLowMemory. By default it allwos the phone, contacts, and messaging apps. I've modified mine to also allow the apps metnioned above.

To add other apps, just find out their app code (directory that they're installed in), then add them here. As a test I'm going to add the browser as well.

ps - I thought about making a patch for this.. but realistically everyone has different preferences.