This post's purpose is to gather in one place all useful info and material needed in order to implement slippy maps in a Swing application using the SwingX-WS library, now that the SwingLabs website is no more -- in spite of the fact that, however, SwingX development is still active.
So, first things first, the as-of-today up-to-date jars, built from the latest sources.
SwingX-ws:
SwingX v. 1.6.5-1 (required runtime dependency, requires Java6 or newer):
A few words on SwingX: it's an amazing project meant to extend swing functionality with extra widgets (a very well made webstartable demo here, with code samples and everything), nice-looking, powerful, fast and with no funky dependencies. One big plus IMHO is that integrates really beautifully with the modern Nimbus L&F (unlike jide-oss, for example, which, albeit very good itself, integrates poorly with Nimbus -- it has, however, a very nice alternative L&F, called Xerto, but this is another story...).
As for documentation, the sources that showcase swingx-ws use best are a series of articles written by Josh Marinacci, listed here in chronological order:
In the [hopefully unlikely] event of needing to report a bug, the project's issue-tracking page can be found on JIRA.