First identify you are paid less than the going rate for your position-- go on a few jobsites and find jobs similair to yours and print them off

sit down with your boss (somone that can actually make a decision and isnt a middleman/yes man - bypass those)

Tell him how long youve been there and what youve accomplished, tell him you are ambitious and want to move forward in the company.
also tell him you feel underalued and are financially struggling -- show him the adverts for your current position and the higher salaries.

most bosses will want some form of deal for giving you more money so be prepared to take on more responsibility

if he says no-- take on board his reasons and then take action

your boss will not lie awake at night worrying that he isnt paying you enough-- if you dont step up you wont ever get more money.

there are always exceptions tho, like my best pal who works for Sony writing Physics Engines and artificial intelligence for PS3 games, another huge american games company saw how good ths stuff he was writing and became very interested in him-- sony promptly marched him into their office and gave him a 12k payrise with some extra benefits. -- my friend didnt even expect it..nice surprise