hand write on pdf?

Does anybody know whether there is an application allowing you to hand write directly on pdf file through usb tablet? For example, take notes, highlight text, or draw some simple figures, etc. For pc, I know PDF Annotator does really a good job, but I haven't found any running on mac.

Thanks in advance!~

up up!!

waiting online!!~~

PDFpen but it's not free. >_<" This one also called Skim which is free. Found here.

I've heard good things about PDFpen (mentioned above): PDFpen: PDF Editing Software for Mac OS X

thanks~! but it seems not support multi-stroke. everytime when you release your mouse or your digital pen, the program will return to select tool from the scribble tool. i.e. you have to re-select scribble tool for the next stroke,,,,, this is so annoying,,,,, am i doing wrong somewhere? or is there any tip for the multi-stroke?

I have no clue, cause I haven't used this program at all. You might want to send them a question about that or check out their support section?