Arduino's 32kB of memory?

Using Arduino Project Guidance
1

I was thinking about getting an SD card shield. Can you load arduino's source code to an SD card for more complex applications?

2

Can you load arduino's source code to an SD card for more complex applications?

No.

3

Need a card with more Flash, SRAM for.
1284P is awesome example - 128K flash, 16K Sram for huge arrays.