From the looks of it, looks like Google started to provide invites already to interested users who wants to get their hands early on google wave, googles new product, which wowed the world in its preview release at Google I/O 2009. For those who doesn't heard of it, Google Wave is a new tool for communication and collaboration on the web. It will combine emails, web chat, wikis, social networking and project management and collaboration in a single communication client. It is open source and has a strong developer base so there will not be any lack of applications in the years to come. You might want to take a sneak peak.
Hoever if you want to get an early invite of google wave to try this amazing thing, click this link