A collection of links to twenty great comics and cartooning tutorials over at PSDtuts. Lots of tips for inking in both Photoshop and Illustrator, coloring, using Photoshop layers to your advantage, achieving halftone effects and other comic-book style looks to your art.
A great resource. You can never have too much information about how other artists use graphics software to create their work. I often take tips from multiple tutorials and create my own workflow from just a tip here and a technique there.
Not all of the tutorials will apply to your style, but I highly recommend reading over all of them. As I mentioned, lots of these tips and walkthroughs go through methods of working in Photoshop and illustrator and even if the style isn’t what you are looking for, there will definitely be a technique or two that will come in handy. Always good to add to your arsenal of Photoshop techniques.