The first mention of this was at the WebmasterWorld thread on Friday night. The webmaster said:
I don't know how recent the change is but I'm seeing much better reporting depth for incoming links from Google WMT tools today. Yahoo site explorer still reports many more but only allows you to export the first 1000.
Personally, I don't really keep track of these reports that closely, but WebmasterWorld administrator said:
In the past few weeks, I've been delighted with the reports of backlinks to internal pages - some very helpful information has been surfaced here.
Have you noticed more depth in those link reports?
Forum discussion at WebmasterWorld.