It should work great with jQuery 1.5.1 and later. We've heard reports that it doesn't work well with jQuery 1.4.x but that is probably a bug we can fix since it doesn't rely on any new jQuery features as far as I know.
I just tried loading it with jQuery 1.4.1 and got the error: "$.type is not a function". So I replaced the $.type use with something else.
If using jQuery 1.4.x is important to you, you can download it again. I just pushed the fix to GitHub.