Yes PS3 supports mkv file format

You can play mkv files in PS3 but not from usb input you need to transfer mkv file from computer to PS3 Hard drive through LAN servers for eg. PS3 Media Server.
How to do that,
Install http://ps3mediaserver.googlecode.com/files/pms-setup-windows-1.20.412.exe in your Windows PC (this is beta version)

Start Server in your PC it will find PS3

Go to your PS3 Video select server

Navigate to file then press Triangle then select copy (this will copy mkv to ps3 hard disk)
Enjoy your mkv video.

Resume cover letter format

{Month Day, Year}

{Name of Hiring Manager}
{Title}
{Company Name}
{Street Address}
{City, State Zip Code}

Dear {Mr./Ms. Last Name} ,

This letter is to express my interest in the {Position Listed in Posting} position listed on CareerBuilder.com. Based on my skills in {Skill Listed in Posting} and {Skill Listed in Posting}, I am confident that I would be a great addition to your team.

My resume that highlights my ability/knowledge/expertise in {A Specific Subject Matter} and {A Specific Area or Industry} is enclosed. During my time at {Your Past Company}, I was able to {succeed/save money/save time/increase sales/increase productivity} in {A Specific Area}. {List a specific example relevant to this position, focusing on how you can help the company}

I am excited about the {Position Listed in Posting} position and the ability to help your company succeed. Thank you in advance for your time. Please do not hesitate to contact me if you have any questions. I would appreciate the opportunity to review my qualifications in more detail and will contact you next {Day of Week}.

Sincerely,

{Name}