LiveJournal will be undergoing maintenance on May 25, and might display errors until complete. Please see 
nickmag_comics we're compiling a list of kid-friendly webcomics. I'm only familiar with a handful but people have already made some good suggestions. We need more!
Do you know any kids who actually read webcomics? If so, ask them what they recommend!
The list is including comics that are "okay" for kids...or "all ages"...but I'd really like to find and spotlight ones that are created with kids age 7-12 specifically in mind (Since that's the the Nick Mag demographic). Tricky business, especially on the web where anything goes. I'd rather not link to comics that are on the same site as stuff a parent might object to.