One of the strong points of texclipse is the relative platform-independence. Same for pdf4eclipse. It would be great if the next
version of texclipse could use pdf4eclipse as the "Ctrl-4" viewer. Right now it is a little complicated configuring the viewers, and  it would be nice if there would be at least one viewer that would almost always work.

Of course, pdf4eclipse has a few issues, like with navigation, but it interprets pdf files just fine.