Priiloader is a modified version of the officially discontinued Preloader. Preloader is a small application which places itself before the System Menu. Its main feature is to directly boot the Homebrew Channel or a file you can install from a FAT device. Preloader is also able to apply memory patches the system menu to remove limitations or other things. Warning! This homebrew makes permanent changes to your Wii’s flash memory (NAND) and should be used with caution.

Changes:

– Fixed bug with USBGecko
– Merged the old black theme with the new white one (thanks BlackPearl & Bad Uncle! ). they are changable in the settings
– Fix some elf loading
– Added a check on boot so some apps can reboot/launch system menu and force priiloader to show up (see magicword.zip)
– Fixed random (with very low % to actually happen)crash when loading dol/elf caused by wiimote
– Re-added USB support. USB is used if SD is not found
– Added Sanity checks when installing priiloader
– Fixed Bootstate bug which made the health check pop up when resetting wii(or returning to wii settings)
– Stopped priiloader from reloading ios if the chosen IOS = the already loaded IOS (in most cases System menu IOS)
– Added Stub IOS Detections when loading bootmii ios or IOS for System Menu. Only IOS 21 seems to be detected as stub…

http://wiibrew.org/wiki/Preloader/Priiloader