The Japanese Slurp I have seen over the last couple of days is actually Slurp.so/1.0 (email@example.com; [inktomi.com...] - they hit one server 26 thousand times over the last two days - I really hate that they do that, its almost like a DOS. Slurp/si only came in 250 times on the same server. There have been no visits from Slurp/cat for me. So maybe something is happening on your particular sight? That would be nice, eh?