I am not really familiar with the Boston logo ( I am a Detroit Tigers fan!) but I believe there is a website that you can plug in the image and it will give you the knitting chart..unless some other kh'er beats me to it...I will post the website if I can find it...
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Favorite Bumper Stickers:
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War doesn't determine who is right: It determines who is left
-That's OK, I wasn't using my civil liberties anyway....
-I'm not afraid to die, I just don't want to be there when it happens.
Reading: Barbara Kingsolver
Knitting: socks
How big in inches do you want the afghan?
How big in inches do you want the logo?
In a 4" swatch how many stitches across and how many rows will your chosen yarn and needles knit up to be?
I am actually making a baby blanket for a friend using that logo. I just plugged it into http://www.microrevolt.org/knitPro/ and got the pattern for it. You may need to tweak it slightly, because the darkness of the background makes it difficult to make out the stitches for it. I just played around with the settings on the site.