Have you read everything on this website already? There are tutorials, instructions, downloads, and resources, check out the links on the left.
Are you using PORTD2 or PORTD7? Those pins are used by the USB bus (please see schematics in download page). If you connect something to them, you might interfere with the USB bus.
Need help with V-USB specific problems? Try the V-USB forum here (http://forums.obdev.at/viewforum.php?f=8).
Did you see this? "avrdude: error: usbasp_transmit: usb_control_msg: sending control message failed, win error: A device attached to the system is not functioning."
Need help in general? USnooBie is sold on Seeed Studio and their forum is here (http://www.seeedstudio.com/forum/viewforum.php?f=4).
Need help with AVR microcontrollers? AVR Freaks (ttp://www.avrfreaks.net/) is right here.
There are plenty of other sites around that have people who can help.
My email is here: