Napkin(http://code.google.com/p/napkin-wave-gadget/) by Marcin Szczepanski of webqem, is cool gadget that was written in Adobe Flex. It allows you to do quick sketches and collaborative doodling.  It provides a canvas on which we can write some sketch designed for small teams or some other people that who just want to play with it. It is good for short descriptive planning or a fun game.

I have just tried it and try to make it useful, i try to create a simple usecase to try its usability, Look at what ive got:

Simple Student Registration Usecase

It was pretty simple and easy to use. Everyone can edit the canvass at the same time.  One downside of this gadget is the lack of an erase function. It would be better if the author can add it on his next release.

The Shiny Wave has a blog on Google Wave helping Scientist Collaborate. I thought that going to some to the gadgets mention there could be interesting. The gadget I found the most interesting is Graphy by Elliott Slaughter.

The gadget allows you to create a graph between different elements and see how it relates to each other. This is really useful when you are describing something and needs to get a connection between some entities.

Sorry for the missing sound,  will make the sound on the next videos.

Using Wave to create the graph could is interesting because there could be different interpretations between on how the connections are. With Wave it is possible to make them connect to each other.

The userinterface is not the most best, because for every keystroke the gadget is recreated. This makes it quite slow when generating when working with the gadget. A way to workaround this is to remove the instruction line in the beginning.

This robot/gadget show cases how it is  possible to make a connection between the two types.

It is not possible to share videos from Youtube unless you use a gadget. Olaf Lederer from Finalwebsites has created a youtube gadget generator.
It simply works by go to the site http://www.finalwebsites.com/googlewave/. Find your youtube file link and the size of the video. The result is a bit.ly url like http://bit.ly/6S4gEW.
You can then insert this url into your Wave and you will get a gadget with the embedded video inside.

What I like about this gadget is that a new gadget is created pr user. The way this is done is by creating an url like http://www.finalwebsites.com/googlewave/gadget.php?url=3WYYu4pZt-M&height=344&width=452, which is converted into the bit.ly url. By using this url it is really easy to generate the gadget XML to embed the video.

I have previous tried to look at the Treeify robot by Peter Svedberg. But I never made it work, so I could make a demo of it. Now I have pulled together the time to have a look at it. This robot was suggested by David Cook from The Shiny Wave. If you have other suggestions of Wave applications, we should have a look please create a comment.

The robot is able to make a tree structure of your documents. The robot consists of a form where the user can administrate the structure. You can create new nodes, which corresponds to new Waves. It is possible to update the name of a node. This is a bit more complex to implement, but it seems to work just fine.

The robot is created in Java, but seems to contain links to a gadget. I have not been able to figure out how the gadget works. It looks like a quite complex infrastructure to make it work.

I have created a video showing how the gadget works.

This video show cases how it is possible to create links between different Wave. Using this architecture it would be possible to create some rather complex structures of Waves. It would make sense if you where using Wave to create a book or something like it.

HTML Gadget by Alex Tkachman lets you add HTML codes to wavelets. Its fairly easy to use. Anything from html tags, css to javascript functions are supported. For any webby like me who wants to spice up my wave a little, will  surely love this little gadget.

This gadget also allows the other participants to edit your code so this would be a nice tool for web developers. Although this gadget is very useful, it also has one big disadvantage. It’s a very unsafe plugin since it allows user generated  javascripts.  This gadget is prone to misuse from ill intentioned developers.