I guess I just can't let this thread die. After all it is call " The Do's and Don'ts of Webcomics", and maybe someone will use the advice they find here.
Here are a few ways (and we do mean a few) for webcomics to become more financially viable, and at the same time do something most of them never thought they could do and still make money: Stay free.
In order for this to work creators are going to have start coming together like never before because no one title on its own is strong enough. And this doesn't mean placing banners on each others sites and saying this is my friend. It means formming a company. Hotbullet Press is a step in the right direction.
For the next example I'm going to use the webcomic "Bigger than Cheese" because it has great untapped pontential. Because it's based on comedy, it does not need high end production to ganner an audiance. But there is no reason why, when the cast is standing around tell jokes, that they cannot be holding branded beverages, wearig shirts that carry logos. Or maybe they can eat Taco Bell on a regular basis, or use a certain brand of cellphone. It can all be done.
"But don't you need some major traffic to do that"?
"Yes".
"And here's how you get that kind of traffic."
Unless you have the coin to place a banner on a high traffic site (and who does), don't bother, it's just a waste of the little money you do have. Save it for food.
It's better to grab the attention of other media. You will get more traffic off a single newspapaer article, mention in a magazine, webzine, or blog, than you will off a wasted banner. And Tech editors are constantly looking for stories. But to get thier attention you are going to have to be diffrent: News worthy. And for this there can be many models. A well prepaired Press Release can also help.
Once again just a few examples for those with an open mind. 
www.bestwebcomics.com