Glitch. There's only two ways it can happen, total loss of all links (unlikely) or a linkage based penalty that brings a PR0 and G has moved away from giving out PR0s following some bad publicity a couple of years ago...
If you seen it through the Google tool bar you probably hit a dead Data Centre.
Use a tool such as Live Page Rank to give you a more overview on how your PR looks. If you see the PR starting to drop in the majority of the D.C's then its time to start asking questions.
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