After doing this little picture above, I figured I would do a roundup of tutorials and resources for comic book effects,coloring,fonts, and more. Hope you find these useful.
First I’ll begin with photoshop effects to make your images look they came right out of a comic book.

This Photoshop Roadmap tutorial is the most popular way of creating the comic book effect.

PSHERO shows you their way of creating the effect. Slightly different than most you will find on the net.

This Tutorial will give you more of a newspaper comic strip look.

Pop Art Effects from VECTORTUTS MELISSA CLIFTON

Here is one more way to do this from TUTORIALS ROOM.

Heres a great, easy way of adding shadows to your photos for a comic book feel.

Yet another way to give your photos the dotted pop art look.

Comic book inspired art from PHOTOSHOP TALENT users.
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Now here is a few guides on coloring with Photoshop.

Comic book and graphic novel coloring from TUTHQ.

Photoshop coloring a manga style drawing.

Photoshop coloring
your 3d renders.

Lizkay has a few tips on coloring your drawings with Photoshop.

Here’s a way to use real life textures to color your images.
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Chris Wahl is a great illustrator that uses photoshop to color his drawings.(Like the Audrey Hepburn above) Visit his blog for more samples of his work.

Great walk-through on doing a comic book style poster from GOMEDIAZINE.
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Here are a few sources for more than enough comic book fonts!

Blambot is probably the most popular spot for comic fonts. Both free and pro.

Dafont has A TON of free comic fonts.

Urbanfonts

Superman
fonts including krypton language!
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MAC USERS: Check out this great application from Plasq called Comic Life to start creating your own comics! Check out THIS POST on Mac360 for more in depth info.
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And last but not least, here is a simple comic drawing animation walk-through.
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Care to add to the list? Leave your suggestions in the comments!