[fogleman]

Looks like you might be right...

,0 The program will be loaded to the start of BASIC memory (2049/$0801)

,1 The program will be loaded absolute, i.e. to its stored location defined by the first two bytes in the binary file. Needed for machine language programs.

http://www.c64-wiki.com/index.php/LOAD

[nkuttler]

With the ,1 you could do fancy stuff like loading your program and executing it with one command. No need for another run command.

[cgh]

You are correct. Actually any non-zero value after the ,8 caused the load to be relocatable. Kind of a cool feature.