Very good point Groxx, my own experience with this was looking for some snippets recently and Google ended up directing me to DZone Snippets[1] for and what I found were snippets from Java 1.3 to do the task that in Java 6 had been completely reworked with some of the new APIs and language features.

So you have a very good point, for longevity, that the snippets need to be versioned.

[1] http://snippets.dzone.com/