Not very often, but I've seen a few like that on Win2k. They started appearing a few weeks ago, IIRC. But I haven't seen any recently.

Whoops. Searching Z for "\ufffd\ufffds" isn't a good idea. It returns 69,936 articles. Google doesn't seem to want to search on "\ufffd\ufffds" - it returns results for "s".

Firefox is using Western (ISO 8859-1) here. FWIW.

Cheers,
Scott.