In the world of agile software development there is little agreement on which practices are "really" agile, and which ones are not. Likewise, people don't agree on which agile practices are most important, and nobody knows which practices are actually applied in how many projects.
In an attempt to gain insight into the current state of the community, Jurgen Appelo is running a survey that could give us answers to these questions if a sufficient number of people participate.
Even though a number of other surveys have already been published before, most notably those of VersionOne and Scott Ambler, Jurgen's survey is the first that does not focus on coarse-grained methods (like Scrum or XP), but on 66 fine-grained individual agile practices. The results are going to be interesting if enough of the community participate.