I want a couple of servos to listen for P.C. input (data from OSC protocol), can I bypass having to use an Arduino?
If I understand your question correctly you're asking if you can control servos with OSC and no microcontroller.
OSC is a protocol used for networking and communication between synthesizers, similar to midi in that, but totally different in the way OSC sends data which looks a bit like XML. 
There's a couple of problems here:
1. Servos will not respond to OSC-signals. You could use MAX/MSP to generate servo-pulses from the OSC. The problem arises whan you are going to send this to the servos using usb. 
2. USB, a fast data-transmission technology, is not suitable to be connected straight into a servomotor.

Arduino uses an atmega16u to transform the data from usb to serial (called a usb to serial programmer) for programming and communication. Then the microcontroller (atmega168/328) takes this and creates a pulse and a signal for the servo-motors. 

To control servos without a micro-controller using USB is impossible. 

It is be possible to control electronics using the serial-port and low-level coding. Used to do stuff like that on a Commodore 64 a time ago. Before these affordable, stable, reliable avr, arm and pic programming cards came out.  

A tip: It is possible to load a program onto an atmega168/328 using a Arduino UNO or similar. Take the chip off of the programming card(ie. the Arduino UNO) and create a stripped down version, containing the micro-controller chip, 16kHz crystal, some capacitors and an usb to serial converter/ftdi-cable. 

Regards
Krister Borge