Drafting A Letter For A Raise

I am working for a Travel company, its a Destination Management company. This i apparently my third year in the company.
I joined here in March 2005, i asked for an increment in March 2006, i managed to get it sanctioned only by August 2006
Now i need another increment, my Appraisal is due in August. i need to know how to approach them again?? i spoke to my boss, he asked me to draft him a letter explaining him that i want an increase.
About myself. when my department opened we were only a team of 3. Now in three years, it have developed and we are a team of 9. I have trained all the rest of my colleagues, being senior, My boss leaves me the responsibility when he is away.. but when it comes to paying me.. the question of increasing my salary never comes up, either i ask for it... or they think i am happy with what i have.. so i want to tell them that i expect a raise... please help me

Hi . i dnt have it, i was hoping perhaps someone could help me withthis one.. Does any one have a sample letter format, of an employee asking for an increement?? Please help

Dear Natashia,
I am giving you a draft letter, might be helpful for you -
Regads,
Pankaj
9928070658
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START
The Director / Manager
Company's Name
Location
Sub : Request for salary revision
Dear Sir,
This is to inform you that I have been working with your company since ______ with complete devotion, dedication, sincerely, honesty, zeal and enthusiasm and leaving no stone unturned in shouldering the entrusted responsibilities.
Sir, these days my family liabilities have sprouted prodigiously and it has been very difficult for me to pull on my expenditures with my current salary. I, being complled, would like to draw you kind attention on the same with a view to having some raise in my current salary.
Look forward to your propitious gesture.
With regards,
XYZ
END