[Scenemaker]

As a general rule of thumb, I store just about every app to the phone memory. Most apps take up very little room and as long as you have all of your personal data such as music, photos and email attachments saved to the memory card, there is very little risk in filling up the storage space on your device. The reason you want to install the app to the phone is that the read/write time is increased by forcing your device to access the memory card to run the app. But, if you would like, you can put some of the apps on the memory card. However, if you flash a new ROM, you have to manually add the icons back into the start menu. There are some apps that you cannot install to the memory card. Some app won't give you a choice at all so those ones are obvious, but others may still give you the choice. Themes for one, cannot be installed to the card. Apps that change the way the phone operates such as screen locking apps, on screen keyboards like swype, home screen modifications such as Cookie and MaxManila to name a few. I used to install TONS of apps on my phone but I am now down to just the ones I use and I archive the rest of the .cabs on my memory card just in case. As long as you don't install every app you come across, you are in no danger of filling your devices limited internal memory.