Waveboard Features
Thanks to some very nice articles about Waveboard (e.g. via Mashable) the community of preview testers became quite big 
A lot of people are asking which advantages using Waveboard has in contrast of using a browser or the Fluid app variant. The answer is: Easy desktop integration and special Google Wave features.
Please also see: Documentation, FAQ and Feature Matrix
Integration
Waveboard integrates Google Wave as you expect it to be from your experience with Apple Mail and other community tools e.g. Twitter Clients or instant messaging. Therefore you get informed of changes via badge symbol in the dock, global colored menu entry and Growl notification. All distracting features of browsers are not needed to use Wave, therefore they have been removed to let you focus on your work with Wave.
Wavy Features
Wave is partly like a big Wiki and therefore you would like to refer to single public waves. Therefore Waveboard has a ‘Copy Wave ID’ function which copies the relevant part into your pasteboard which identifies such a wave. But Waveboard also registers to open such waves by it’s ID like the following one: wave:googlewave.com!w%252BokwsJjQSA If you have got installed Waveboard on your Mac a click on that link should open a public wave directly in the Waveboard App. This is one example, more features like this will come in the next releases.
I hope you like the idea of Waveboard, making the work with Google Waves easier. The development of this tool – and the one for the iPhone – is still in an early phase. So your feedback and inspiration is very welcome. Thanks for your patience.