I have installed 2012-07-15-wheezy-raspbian, and the i2c-dev module and i2c_bcm2708 are there and work with i2c-tools.
How do I get the i2c-dev module etc. to load at bootup?
Assuming the module loads using
sudo modprobe i2c-dev, you should add
They are blacklisted in /etc/modprobe.d/raspi-blacklist.conf
# blacklist spi and i2c by default (many users don't need them) blacklist spi-bcm2708 blacklist i2c-bcm2708
so comment these lines.