I just uploaded a simple reddit clone sample Seaside application to SqueakSource. It's meant be a very simple reference application to learn from, it's only about 4 hours work total. There are comments throughout, and various techniques are used to demonstrate different ways of doing things. Some forms are generated directly via Seaside and some other by Magritte. Persistence is implement in image using dictionaries and collections.
Features include login, register, add entry, vote on entry, comment on entry, comment on comment. There are probably a few bugs. I'm not making any claims of best practice, only showing various ways I accomplish things to suite my needs.
Hopefully such an application will make Seaside more approachable for the newbie and help ease the lack of documentation available. I know when I first started learning, I was far more interested in actual samples than outdated documents. Enjoy!
UPDATE: Loading this code requires that you create a repository in Monticello. Just create a new HTTP repository with the following template using the +Repository button.
MCHttpRepository location: 'http://www.squeaksource.com/SmallReddit' user: '' password: ''
Once done, you can open the repository, select the package, and load it. It will create an application on localhost at /seaside/smallReddit, on whatever port you're running Seaside on. You could also just download the mcz file directly and drag and drop it into your squeak image, at which point you'll be prompted and asked what you'd like to do.
See my previous screencast about using Monticello for a quick visual on using Monticello.