I'm no longer seeing different results or different numbers of results for any searches I perform at Google with inanchor and allinanchor. I can't find any official reference to this change, but since they were working in January, my initial assumption is that BigDaddy caused the effect, which is why some folks can still see the allinanchor results on certain datacenters (or for certain phrases).

If you've got any substantive data or links to point to that would help to make this more official, that would be greatly appreciated.

Luckily, we can use MSN's "inanchor" command still - note the syntax here - allinanchor doesn't work so inanchor: must be placed in front of each term. Sadly, MSN's number of reported results are so far off, the data is not currently of much help.