At Write Comics, you can create your own comic strip by choosing backgrounds, characters and adding dialogue. This is a very easy interface, but it's not forgiving. There is no undo feature, so kids might need to start again if they're not happy with placement etc. There is a nice range of characters, including animals, props and aliens, several different backgrounds, and speech bubbles. When you choose a speech bubble, it appears on your panel, but you need to add dialogue or thoughts in the box below.
Once finished, you click and immediately get a link where your comic can be viewed. There's no need to register, which makes it great when you're in a hurry.
My example at left shows two weaknesses on my part. Hurried screen grabbing meant I cut off a little text, but also, in the first frame, I think the grandpa and his speech bubble should have been at left, because that's where our eyes tend to read first. Luckily I know that reflecting on what we've done, and learning from our mistakes are a big part of learning!
Write Comics is another online place where you and your kids could could do some creating. Parental supervision is a must as usual. And I definitely still prefer ToonDoo. However, it's wonderful to have so many choices where all of us kids can engage with story and write for an audience.