[Wired1]

Ok, an update:

it's in the PROFILEFIELD table.

Example of the code, as well as a breakdown:

Main things to know:

profileid = (whatever)
type = 'checkbox'
data = a:6:{i:0;s:3:"ONE";i:1;s:3:"TWO";i:2;s:5:"THREE";i:3;s:4:"FOUR";i:4;s:4:"FIVE";i:5;s:3:"SIX";}

The data field broken down a bit:

a:6:{

i:0;s:3:"ONE";
i:1;s:3:"TWO";
i:2;s:5:"THREE";
i:3;s:4:"FOUR";
i:4;s:4:"FIVE";
i:5;s:3:"SIX";

}

a:6 means an array of 6 fields

i:<VARIABLE 1>;s:<VARIABLE 2>:"CHECKBOX NAME";

example: i:0;s:3:"ONE";

i:0 (i stands for ID) is the first checkbox;
s:3 (s stands for STRING) indicates how many characters in the checkbox name
"CHECKBOX NAME" - self explanatory :)