Boffintronics has created a line of audio and video breakout boards for RCA and headphone jacks.
Each has 0.1″ connectors on the bottom for plugging into standard breadboards as well as terminal blocks to connect wires.
We have 4 different boards, all available at Addicore.com;
Single RCA with 5 different RCA jack color options
Dual RCA with red and white RCA jacks
Triple RCA with red, white, and yellow RCA jacks
3.5mm headphone jack with integrated switch