For My Own Reference:

Craftster 12" Square Craftalong
http://www.craftster.org/forum/index.php?topic=117318.0

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24 Finished Squares:

http://www.flickr.com/photos/97382664@N00/sets/72157601268384069/

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Oct

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Solid Stripe:

http://www.texasdg.net/daynascrochet/pattern.asp?id=22

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Birthday Flower:

http://www.geocities.com/cdjsimon/birthday_flower.html

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Nov

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Racing Stripes:

http://www.texasdg.net/daynascrochet/pattern.asp?id=71

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Dutch Square:

http://www.jpfun.com/patterns/01granny/dutchsquare.shtml

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Dec

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Maggie's Square:

http://www.heartmadeblessings.org/patterns/Maggiessquare.asp

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Octagon Medallion:

http://members.aol.com/crochetalong/hexpill.html

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Jan

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January Square:

http://www.heartmadeblessings.org/patterns/jansquare.asp
(see page 20 of Craftster thread for correction)

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New Year's Eve:

http://www.heartmadeblessings.org/patterns/newyearseve.asp

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Feb

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Cable Hearts:

http://www.geocities.com/cdjsimon/cableheart.html

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Center Heart Square:

http://www.heartmadeblessings.org/patterns/Centerheart.asp

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Mar

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Pinwheel:

http://dayna.tdgservices.com/ShowPattern.aspx?PatternID=23#

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Schoharie Spring:

http://maryatthemanor.blogspot.com/2005/09/schoharie-spring-12-square-pattern.html

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Apr

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Butterfly Garden:

http://www.geocities.com/cdjsimon/butterfly_garden.html

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Floral Overlay:

http://www.pandacrochet.8m.com/floral-overlay.html

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May

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Windowpane:

http://www.pandacrochet.8m.com/floral-overlay.html

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Waldo's Puzzle:

http://www.geocities.com/cdjsimon/waldos_puzzle.html

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June:

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Tilt-a-whirl
http://www.geocities.com/cdjsimon/tiltawhirl.html

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Cherries Jubilee (see correction on craftster thread page 37)
http://maryatthemanor.blogspot.com/2005/09/cherries-jubilee-12-square.html

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July:

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Pineapple Square
http://pandacrochet.8m.com/pandapineapple.html

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Square in a Square

http://www.p2designs.com/pdfs/grannyquilt-SqInSq.pdf

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Aug:

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Circles on the Square

http://www.heartmadeblessings.org/patterns/circlesonthesquare.asp

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Maple Leaf
http://www.p2designs.com/pdfs/grannyquilt-maple.pdf

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Sep:

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http://pandacrochet.8m.com/pandamanlysq.html

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http://www.p2designs.com/pdfs/grannyquilt-4sq.pdf

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Other interesting-looking squares to try~

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Victorian Dream: http://www.crochetpatterncentral.com/patterns/victorian_dream_square.php

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* Star Overlay:

http://www.geocities.com/cdjsimon/star_overlay.html

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'I Love the V-stitch':

http://dayna.tdgservices.com/ShowPattern.aspx?PatternID=42

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Crochet Pattern Central list of 12" squares~
http://www.crochetpatterncentral.com/directory/12in_squares.php

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Dayna's Crochet 12" squares:

http://dayna.tdgservices.com/Patterns.aspx

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Flat Braid Joining Method ~ (also has Simple Square pattern)
http://members.aol.com/_ht_a/lffunt/flatbraid.htm

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Basic Granny Square~
http://www.jpfun.com/patterns/free/101/f101101_basicgranny.shtml